List of Earth starships in Stargate

Over its decade of existence, science fiction TV series ''Stargate SG-1'' developed an extensive and detailed backdrop of diverse characters. Many of the characters are members of alien species discovered while exploring the galaxy through the Stargate, although there are an equal number of characters from offworld human civilizations. While ''Stargate SG-1'', ''Stargate Atlantis'' and ''Stargate Universe'' are separate shows, they take part in the same fictional universe, so no character is internally show-specific.

Main characters

Except for the commanders of the top-secret Stargate Command military base (SGC), all main characters of ''Stargate SG-1'' are members of the SG-1 team, the primary unit of the SGC in the show. SG-1's duties include first contact, reconnaissance and combat, diplomacy, initial archaeological surveying, and technological assessment. The composition of SG-1 changes several times during the series run and varies in several alternative universes.

Jack O'Neill

Jack O'Neill is a USAF colonel (later brigadier general, major general and then lieutenant general) who led the original mission through the Stargate in ''Stargate''. He is played by Kurt Russell in the film, and by former ''MacGyver'' actor Richard Dean Anderson in a regular role in seasons 1–8, and in a recurring role in seasons 9–10, also Michael Welch played young Colonel O'Neill in episode "Fragile Balance". He also appears in ''Stargate: Continuum'', and in seasons 1 and 3 of ''Stargate Atlantis''. Colonel O'Neill is the leader of the SG-1 team in the first seven seasons, and takes charge of Stargate Command after his promotion to brigadier general at the beginning of season 8. He is promoted to major general at the beginning of season 9, and is reassigned to Washington, D.C., then makes sporadic appearances in the final episodes of season one of Stargate Universe.

Daniel Jackson

Dr. Daniel Jackson is a brilliant archaeologist and linguist, specializing in Egyptology, whose unusual theories concerning the origin of the Egyptian Pyramids led to his participation in the original mission through the stargate in ''Stargate''. He is played by James Spader in the film and by Michael Shanks in a regular role in seasons 1–5 and 7–10, with a recurring role in season 6. He also appears in both direct-to-DVD films and in seasons 1 and 5 of ''Stargate Atlantis''. Daniel joins the SG-1 team in search of his kidnapped wife (Sha're), until she dies in season 3. However, he decides to remain a part of SG-1, and does so until his ascension at the end of season 5. Following his decision to retake human form, he rejoins SG-1 at the beginning of season 7.

As stated in season 2's "1969", Daniel speaks 23 languages, including Russian, German, Spanish, and Egyptian. Throughout the run of the series, he becomes Earth's foremost expert on the Ancients, and also learns many alien languages, such as Goa'uld, Ancient, and Unas.

Samantha Carter

Samantha "Sam" Carter is an astrophysicist and USAF captain (later major, lieutenant colonel, colonel, then brigadier general). She is played by Amanda Tapping in a regular role in seasons 1–10, in both direct-to-DVD films and makes an appearance in all seasons of ''Stargate Atlantis''. Captain Carter joins SG-1 under the command of Col. O'Neill in season 1. Following her promotion to major in season 3, she is promoted to lieutenant colonel in early season 8 and assumes command of SG-1. She assists Lt. Col. Cameron Mitchell in seasons 9 and 10. After her appearance in ''Stargate: The Ark of Truth'', she is promoted to a "full bird" colonel and becomes the new commander of the Atlantis expedition in season 4 of ''Stargate Atlantis'' before joining SG-1 again for ''Stargate: Continuum''. She is later made the commander of the USS ''George Hammond'', a ''Daedalus''-class Earth ship named after former SGC commander General Hammond, who died in correlation with the actor who played him, Don S. Davis.

Teal'c

Teal'c is a Jaffa from the planet Chulak. He is played by Christopher Judge in a regular role in seasons 1–10, in both direct-to-DVD films and in season 4 of ''Stargate Atlantis''. Throughout the entire run of Stargate SG-1, the only episode that the character was absent was Season 8's " Prometheus Unbound". Teal'c states that he is 101 years old in season 4's " The Light", and ages an additional 50 years in season 10's "Unending". His catchphrase is "Indeed". Teal'c's most notable feature is a golden tattoo on his forehead, a sign that he once served the Goa'uld Apophis as First Prime, the highest Jaffa rank. His interaction with Bra'tac (Apophis' former First Prime) and his own personal experiences led him to doubt the divinity of the Goa'uld.

Teal'c defects from Apophis in the pilot episode and joins the SG-1 team, believing this to be an opportunity to eventually defeat the Goa'uld and bring freedom to all Jaffa."Children of the Gods" He leaves his wife Drey'auc and his son Rya'c behind on Chulak. After succeeding in killing Apophis in season 5's " Enemies", Teal'c and Bra'tac make first progress in uniting a sizable group of Jaffa resistance warriors in season 5's " The Warrior". Teal'c and Bra'tac lose their symbiotes after a sabotaged rebel Jaffa summit in season 6's " The Changeling", but the Tok'ra drug Tretonin can sustain them and eventually becomes instrumental in liberating Jaffa from physiological reliance on Goa'uld symbiotes,. Teal'c and Bra'tac eventually lead the Jaffa to victory over the Goa'uld in season 8's "Reckoning"/"Threads". Teal'c is chosen as a member of the new Jaffa High Council and supports Bra'tac as an interim leader in season 9's " The Fourth Horseman" before a type of government is solidified.

George S. Hammond

George S. Hammond is a USAF Major General (later Lieutenant General) who commands Stargate Command in the first seven seasons. He is played by Don S. Davis in a regular role in seasons 1–7 and in a recurring role afterwards. He also appears in ''Stargate: Continuum'' and season 1 of ''Stargate Atlantis''. Hammond took over from Major General West, commander of the Stargate Project in the original ''Stargate'' film, and originally intended the Stargate Program to be his last assignment before retirement. In season 2's "1969", General Hammond is shown to have worked at the Cheyenne Mountain complex (the present-day location of Stargate Command) in 1969. Hammond originates from Texas and became a widower when his wife died of cancer.

Hammond briefly retires under duress in season 4's "Chain Reaction", where he spends time with his two grandchildren, Kayla and Tessa. He is promoted to the rank of lieutenant general at the beginning of season 8, being placed in command of the new Homeworld Security command, a department in control of Stargate Command, the ''Prometheus'' project, and the Atlantian Antarctica outpost. Hammond recurs in the season 1 of ''Stargate Atlantis'' and seasons 8 through 10 of ''Stargate SG-1''. Hammond appears in a civilian suit instead of a military uniform in season 9's " The Fourth Horseman", and Carter confirms his retired status in season 10's "The Road Not Taken". In his last appearance in the alternate timeline film '' Stargate: Continuum'', Hammond acts as a military advisor to President Henry Hayes.

Don S. Davis knew Richard Dean Anderson (O'Neill) from Anderson's starring role in ''MacGyver'', in which Davis was a stand-in for Dana Elcar (playing Pete Thornton, MacGyver's boss) before making several guest appearances. Davis died from a heart attack at the age of 65 on June 29, 2008, shortly before the release of ''Continuum'', making this his final on-screen appearance as General Hammond. For his portrayal of Hammond, Don S. Davis was nominated for a 2004 Leo Award in the category "Dramatic Series: Best Supporting Performance by a Male" for the season 7 episode " Heroes, Part 2".

Jonas Quinn

Jonas Quinn is an alien from the planet Langara. He is played by former ''Parker Lewis Can't Lose'' actor Corin Nemec in a regular role in season 6, and in a recurring capacity in seasons 5 and 7. Jonas leaves his home planet Langara the penultimate season 5 episode "Meridian" after witnessing Daniel Jackson's lethal sacrifice and the following gleeful reaction of his planet's leaders. He is a fast learner and fills Daniel's empty spot on SG-1 in season 6. Following Daniel's return at the beginning of season 7, Jonas returns to his planet and last appears in the mid-season 7 episode "Fallout".

Corin Nemec replaced Michael Shanks (Daniel Jackson) during season 6 after Shanks had left the show amid controversy after season 5. The producers based Jonas's motivation to join SG-1 on his momentary reluctance to actively prevent Daniel's death and his feelings of responsibility afterwards. Jonas was slowly integrated into the story in a prolonged transition stage over the first half of season 6. Nemec was open to continue playing Jonas Quinn after season 6, but a new contract was reached with Michael Shanks for Daniel to return in season 7. The role of Jonas was reduced to recurring status in season 7.

Cameron Mitchell

Cameron "Cam" Mitchell is a USAF lieutenant colonel. He is played by former ''Farscape'' actor Ben Browder in a regular role in seasons 9–10 and in both direct-to-DVD films. Mitchell is introduced in "Avalon" as the leader of a squadron of F-302s against the forces of the arch villain Anubis in season 7's "Lost City". Assigned as the new commanding officer of SG-1 at the beginning of season 9, Mitchell struggles to reunite the team's former members under his command. Assisted by Carter (who is of equal rank), he remains in command of SG-1 throughout the series run and both films. He is promoted to the rank of full-bird Colonel in ''Stargate: Continuum''.

Ben Browder joined the cast after Richard Dean Anderson's departure from ''Stargate SG-1'' in 2005. From the beginning, producer Robert C. Cooper wanted Mitchell to be a "super fan" of SG-1 who is openly enthusiastic about exploring the galaxy. Mitchell is often at the center of the action and fight sequences. The producers did not realize the physical resemblance between Browder and Michael Shanks when Browder was cast, and employed make-up and costuming techniques to make the transition easier for the audience. The writers' decision to put Mitchell in command of SG-1 instead of Carter was met with resistance by some critics and audience members. For his portrayal of Cameron Mitchell, Ben Browder was nominated for a Saturn Award in the category "Best Supporting Actor on Television" in 2006.

Hank Landry

Henry "Hank" Landry is a United States Air Force Major General and the commander of Stargate Command from season 9 onwards. He is played by Beau Bridges in a regular role in seasons 9–10, in both direct-to-DVD films, and in the ''Stargate Atlantis'' episodes " The Intruder", "Critical Mass", "No Man's Land", and the two-part episode " The Return" of seasons 2 and 3. General Landry is introduced in ''SG-1'' season 9 premiere, "Avalon", having been hand-picked by Jack O'Neill to succeed him. Landry once served as a pilot in the Vietnam War and met a Vietnamese woman named Kim Lam. They had a child, Carolyn Lam, but Landry became estranged to them and left them due to his involvement in military intelligence. Carolyn Lam grew up to be a doctor and was assigned to Stargate Command as chief medical officer in seasons 9 and 10. Bridges said that "Landry truly loves his work utrespects and appreciates his daughter. He wants a real relationship with her and hopes that will happen some day. At the start of eason 9 you're not sure what their relationship is." The late season 10 episode "Family Ties" brings some conclusion to the Landry-Lam enstrangement, showing a reunification between Landry, Carolyn and Kim Lam in a restaurant.

''TV Zone'''s Steven Eramo described Landry as "fair, intelligent, even-tempered and having a good sense of humour". Bridges thought that " andrylikes to empower his team. He realizes how challenged they are. It's a huge burden to protect their country from the entire galaxy, but he also recognizes that, like himself, they are human beings. ..Sometimes he does that with a bark, and sometimes with a bite, but he also has a sense of humor, this man. And he likes to fool with people." According to Bridges, Landry appreciates Carter's knowledge, and needed some patience with the fast-speaking Daniel Jackson to realize "how important a piece of puzzle" he is. He respects Teal'c as a warrior, and is willing to foster the potential he sees in Vala.

The ''Stargate'' producers approached Beau Bridges, a self-claimed fan of science fiction, directly to play the role of Hank Landry. Although the producers had some ideas for the characters, they collaborated with Bridges to develop the character's backstory before the writing of season 9 began. Bridges wanted the character to be three-dimensional by revealing a layered backstory over the course of the show. Bridges researched famous US generals from George Washington to John P. Jumper to get a feeling for the role. He accumulated quotes by generals that Landry would respect, and gave the list to producer Robert C. Cooper, who in turn used it as free research. Bridges made no deliberate effort to distinguish his character from General O'Neill, believing that the character could stand on his own.

Vala Mal Doran

Vala Mal Doran is a con artist from an unnamed planet and a former human host to the Goa'uld Qetesh. She is played by former ''Farscape'' actress Claudia Black in a regular role in season 10 after having recurred in seasons 8 and 9 of ''SG-1''. Her first appearance in season 8's " Prometheus Unbound" is followed by a recurring role in season 9, where she and Daniel unintentionally set off the new Ori threat. She joins SG-1 after giving birth to the new leader of the Ori at the beginning of season 10, and appears in both direct-to-DVD films.

Vala was created by Damian Kindler and Robert C. Cooper as a one-time character, but because of the on-screen chemistry between Black's Vala and Shanks' character Daniel Jackson, and the character's popularity with the producers and the audience, Claudia Black became a recurring guest star in season 9 and joined the main cast in season 10. For her portrayal of Vala, Claudia Black was nominated for a 2006 Saturn Award in the category "Best Supporting Actress on Television", and won a Constellation Award in the category "Best Female Performance in a 2006 Science Fiction Television" in 2007.

Recurring Stargate Command personnel

The Stargate Command (SGC) is a fictional military base (and real broom closet) at the Cheyenne Mountain complex near Colorado Springs, Colorado. It is the main setting in ''Stargate SG-1'' and occasionally features on ''Stargate Atlantis''. The base extends many levels beneath the ground and is protected from most forms of attack including indirect nuclear detonations, also serving to contain biological, chemical or alien hazards to the outside world by means of a 'lockdown' status. Stargate Command is typically commanded by a General and is staffed by subject matter experts and military support personnel, several elite special operations teams, and several SG teams, including SG-1. The majority of the teams are United States Air Force with some United States Marine Corps, civilians and United States Army, but other nations have SG teams operating from the SGC as well after the events of season 5.

Janet Fraiser

Captain/Major Janet Fraiser, the resident Chief Medical Officer of the SGC (played by Teryl Rothery, seasons 1–7, 9) – She is responsible for maintaining the health of the SG teams, as well as the SGC's support staff and base personnel. On many occasions, she also cares for the health of alien refugees to Earth, including Goa'uld symbiotes. In her first appearance in " The Broca Divide", Dr. Fraiser holds the rank of captain, and is promoted to major in Season 3. In season 1's " Singularity", Fraiser adopts Cassandra, an alien orphan whose people had been exterminated by the Goa'uld System Lord Nirrti. Dr. Fraiser is killed by a staffweapon blast in season 7's " Heroes" during an off-world medical emergency, but she returns in season 9's "Ripple Effect" as a parallel universe version of Dr. Fraiser, in her reality a regular member of SG-1. Before Fraiser returns to her reality, Carter, Jackson and Teal'c are able to give her a final goodbye. Dr. Fraiser is also shown alive in an alternate timeline in the year 2010 in season 4's "2010", but Fraiser and SG-1 alter the timeline to prevent a catastrophe on Earth involving the Aschen race.

Fraiser joined the United States Air Force (USAF) after breaking up with her husband; there she got some training with firearms. Her husband did not want Fraiser to join the US military which is one of the main reasons for their breakup. As a doctor, Fraiser looks for peaceful solutions and is disinclined towards armed solutions. In the episode "Serpent's Song", Fraiser is the only one in Stargate Command (SGC) who is resistant to the idea to give Apophis over to his enemies. She is eventually forced to give up Apophis.

Teryl Rothery was asked by then producer and writer (for ''Stargate'') Jonathan Glassner and Brad Wright if she wanted to play the role as Fraiser. In an interview, Rothery was asked what it was like to play a doctor in ''Stargate SG-1''. Rothery replied, "just being true to the character. And as far as the medical stuff, knowing what to do and what to say." She got a lot of help from the medical advisor on the set.

In the first two seasons, Rothery did not have a contract and was booked on every episode in which she appeared. In season three of ''SG-1'', she finally got a contract deal with the producers. She also commented on her acting life once, "The life of an actor is always very up and down. So sometimes you work a lot, but sometimes ... So if you're on a series like ''Stargate SG-1'' you have that work for seven years. So that's a gift."

After her character's death in season 7, there were various rumours which said she would appear in the upcoming ''Stargate'' film; this never happened. Rothery said it was unlikely since she had not had any contact with the ''Stargate'' producers since her character's death. Rothery has stated many times that she "admires" the character because of her "strength" and "intelligence". Robert C. Cooper, producer for ''Stargate SG-1'', called Rothery about the death of her character. Cooper said, "It is our last year, so we are thinking of killing one of our regulars." Fraiser was killed off in the episode " Heroes" because the producers thought season seven would be the last in the series and felt that a death of the main cast was needed. Rothery also appeared on the ''Women of Sci-Fi calendar'' produced by fellow ''Stargate'' cast Michael Shanks and Christopher Judge.

Walter Harriman

Chief Master Sergeant Walter Harriman (also known as the Chevron Guy among others, portrayed by Gary Jones, seasons 1–10) joined the Stargate Command (SGC) after excelling in navigation and automatic flight control operations during the first Gulf War. General Hammond recruited him as someone with excellent technical ability and a cool head to operate the Stargate under extreme pressure. He specializes in installing, maintaining and repairing bomb navigation, weapons control as well as automatic flight control systems. He is also an expert in radio and navigational equipment, and in maintaining test and precision measurement equipment. He is primarily a Stargate technician, running the dialing computer and other equipment from the Control Room. He also acts as an occasional administrative assistant to the head of Stargate Command, and has manned the flight console on the bridge of the Prometheus. From season 8 to 10, Harriman's role is expanded to advisor to the Head of Command of the SGC.

His name has been a source of confusion for many fans of ''Stargate SG-1''. Originally, he was simply "Technician" or " Sergeant", listed as such in the show credits. At some point, some of the writers gave him the name "Norman Davis", which came with a name tag, but was never used in dialogue. In the episode "2010", Jack O'Neill refers to him as "Walter". Later, in the eighth season of "Stargate SG-1", the character is addressed as "Sergeant Harriman", with "Harriman" actually based on General George Hammond addressing him as "Airman" what was misheard by fans because of Don S. Davis's Texan accent, resulting in the final name of "Walter Harriman". Many fans fondly refer to him as "the Chevron guy" as many of his on-screen appearances, especially earlier on in the show, had him saying "Chevron (insert number here) encoded". On several DVD commentaries after the introduction of the name "Walter", producer-director Peter DeLuise refers to the character as "Walter Norman" and "Walter Norman Davis". The first time he ever says his own name is in the ''Stargate Atlantis'' episode "Home".

As the series continued Harriman got a heavier role in the series. According to Jones, his role was expanded since Richard Dean Anderson wanted him as his personal assistant in the show when his character Jack O'Neill was the leader of the SGC. The ''Stargate'' producer and writer staff called 2005, ''The Year of Walter'' because the staff evolved Harriman's relationship with General Hank Landry. Jones does not have a binding contract with the ''Stargate'' producers.

Charles Kawalsky

Charles Kawalsky portrayed by John Diehl (in the film) and Jay Acovone (in the series), is introduced in the 1994 ''Stargate'' as lieutenant colonel. He is Jack O'Neill's second in command for the first mission through the Stargate to Abydos and returns to Earth afterwards. When the Goa'uld Apophis attacks the SGC in the pilot episode of ''Stargate SG-1'', Kawalsky is re-introduced as a captain and reunites with his former teammates to bring Daniel Jackson back to Earth. Kawalsky is promoted to major and becomes the leader of the newly formed SG-2 team, accompanying SG-1 on their mission to Chulak to rescue Sha're and Skaara. However, before returning to Earth, Kawalsky is invaded by a Goa'uld parasite from a dead Jaffa warrior. In season 1's " The Enemy Within", the symbiote starts to take control of him back on Earth. A surgical removal of the Goa'uld is initially successful, but the symbiote turns out to be a dead husk whose intelligence has already taken over Kawalsky's mind. Kawalsky is eventually killed when Teal'c forces his head through the event horizon and closes the gate, severing most of Kawalsky's skull including the lobes controlled by the symbiote.

Despite the character's death, Kawalsky appears several more times in the series. In season 2's " The Gamekeeper", O'Neill and Teal'c encounter Kawalsky in a virtual reality simulation. In season 3's " Point of View", Kawalsky and Samantha Carter from an alternate reality arrive through the gate seeking help in contacting the Asgard. His last appearance is in season 8's " Moebius", in which Kawalsky returns in an alternate timeline accidentally created when the destruction of their time machine traps SG-1 in the distant past. Kawalsky accompanies O'Neill, Carter and Daniel to Chulak and again meets his end, although here he is merely shot; it is the alternate Daniel Jackson who is infected with the Goa'uld and killed by Teal'c.

Darren Sumner called Kawalsky "one of the 994film's strongest characters". Sumner called the high death numbers of secondary and recurring characters on the show, ''The Kawalsky Effect''. A Kawalsky action figure was created after the release of the 1994 film. He also has a card in the card game, '' Stargate TCG''. In the card game he is listed as a good soldier. While only appearing in six episodes in total, actor Jay Acovone frequently appears at ''Stargate'' conventions.

Sylvester "Sly" Siler

Master Sergeant Sylvester "Sly" Siler, (played by Dan Shea, seasons 1–10) – A sergeant at the SGC and one of its primary technicians and engineers. First appearing in season 1's "Solitudes", he remains a background character throughout the run of ''Stargate SG-1'' and also occasionally appears in Earth-based episodes of ''Stargate Atlantis''. Dan Shea is primarily the stunt co-ordinator for ''Stargate SG-1'', responsible for the budgets and locations of stunts, and the hiring of stunt people before co-ordinating all stunt action. Siler is subsequently shown to be involved in many accidents at the SGC, which is parodied in dialogue and action in several ''SG-1'' episodes such as season 4's "Window of Opportunity", season 7's " Heroes" and the milestone episode "200".

Shea first auditioned for the role as Siler with executive producer Brad Wright and director Martin Wood. Shea commented on his first audition that he tried to be "Funny", thinking he could get the role easier that way. Executive producer Michael Greenberg said that Shea "Blew it", Shea then went for a second audition acting more serious, since according to Greenberg the role was "Serious" and he needed to act that way. Siler also frequently appears in the background of scenes carrying an oversized wrench, which he sometimes hands to director Martin Wood as a gag prop in the series. Siler's first name is never mentioned in dialogue in the series, although his uniform patch and magazines give his first name as "Sly" several times, and his uniform patch in "Entity" reads "Dan". According to producer and writer Peter DeLuise, Siler's name and dialog deliberately contain the letter "S" because Dan Shea lisps.

Shea had previous worked with both Richard Dean Anderson (who portrayed Jack O'Neill) and Greenberg before on the American television series ''MacGyver'' in the 80s and early 90s as Anderson's stand-in in stunt scenes, he continued this role in ''Stargate SG-1''. Anderson's partner Greenberg gave the job as stunt coordinator and stand-in to Shea in ''Stargate SG-1''. The first time Shea was officially double for Anderson was in Toronto when they did a ''MacGyver'' movie; Anderson had broken his foot so Shea was forced to do a stand-in.

Minor characters

* Major Louis Ferretti, (played by French Stewart in the film as Lieutenant Louis Ferretti and Brent Stait in season 1) – A member of the United States Air Force and one of the four survivors of the first expedition through the Stargate in ''Stargate''. Ferretti joins O'Neill's team on another mission to Abydos in "Children of the Gods", and is put in charge of the SG-2 team after the death of Charles Kawalsky in " The Enemy Within". Ferretti makes his last appearance in season 1's "Within the Serpent's Grasp" to follow SG-1 through the Stargate, and is mentioned in season 3's "Shades of Grey" as a possible new leader of SG-1.
* Colonel Robert Makepeace (played by Steve Makaj, seasons 1–3) was a former member of the United States Marine Corps and of Stargate Command (SGC). Originally, Makepeace was the commander of SG-3. His first on-screen appearance is in " The Broca Divide" as ranking officer and team leader of SG-3. He reappears in the two episodes, two-parters in ''Stargate SG-1'' season 2. In the two-parters of season 2, Makepeace leads a rescue mission to save SG-1 (without Teal'c) from the grasp of Hathor in " Into the Fire". In season 3's "Shades of Grey", Makepeace is discovered to be a spy for the rogue N.I.D. group under the command of Colonel Harry Maybourne, who is covertly reverse-engineering stolen alien technologies. Smaller items stolen by the rogue group would be left on a designated world for Makepeace to covertly pick up and pack back to Earth in his gear during routine missions. O'Neill had Makepeace arrested and charged with high treason against the United States and its allies. While it is unknown who immediately replaced Makepeace as the commander of SG-3, eventually this position was assigned to Colonel Reynolds.
* Colonel Albert Reynolds, (played by Eric Breker, seasons 2, 5, 7–10) – Introduced in " Touchstone" as a Major stationed at Area 51 and a member of the National Intelligence Department (NID). In early 2001, He is promoted to lieutenant colonel and was given command of SG-16 on a mission to Velona. By early 2003, Reynolds had received command of SG-3, succeeding Robert Makepeace who was charged for high treason against the United States and its allies. He was also one of the few airman who helped Jack O'Neill defend Stargate Command against the Replicator army that Replicator Carter had sent through the Stargate to attack Earth while she focused on conquering the Milky Way galaxy. Reynolds was the leader of the SGC during Hank Landry's vacation to Jack O'Neill's cabin, Samantha Carter assumed his post until he returned from his mission to P9J-333.
* Doctor Robert Rothman, (played by Jason Schombing, seasons 3–4) – A scientist who prior to joining Stargate Command was Daniel's research assistant. He first appears in season 3's " Forever In A Day" in a Hand device-induced delusion of Daniel Jackson, where he is placed on SG-1. His first non-fantasy appearance is in "Crystal Skull", where Rothman is tasked with researching a crystal skull. Rothman becomes a host to a Goa'uld larva and during a rescue mission on an offworld archaeological dig site in "The First Ones" and is shot dead by Colonel Jack O'Neill.
* Major Michael Griff, (played by Russell Ferrier, season 4) – Was a member of SG-2 as a captain. He accompanied SG-1 in its search to recover SG-11 and Dr. Daniel Jackson on P3X-888; during the course of the mission he was wounded by a staff weapon blast, but recovered. As commander of SG-2, Griff led a search for SG-1 after that team went missing on P3R-118. After braving a glacier that Administrator Calder had insisted SG-1 had set out to investigate, he became convinced that Colonel O'Neill would never have authorized such a mission. At General Hammond's instruction, Griff drew up plans for a covert search and rescue mission, which ultimately proved unnecessary. Later that year, Griff and SG-2 were assigned to "babysit" a team of scientists on M4C-862, a mission he sarcastically described as "non-stop excitement". When O'Neill and Teal'c arrived to relieve him, he was visibly pleased not to be responsible for dealing with the scientists anymore.
* Doctor Bill Lee, (played by Bill Dow, seasons 4, 6–10) – A civilian scientist and engineer who works at Stargate Command and is often called upon to work with alien technology. He first appears in "Prodigy" but does not step in the foreground until "Evolution" where he and Daniel go on a mission to Honduras to locate the Ancients' healing device but are captured and tortured by local terrorists. As seen in " Heroes", Dr. Lee is responsible for creating a staff weapon-resistant armor. He is also a recurring character on ''Stargate Atlantis''. He devises a way to relay a warning to Atlantis in "Critical Mass" and gates to the Pegasus Galaxy from the Midway Station in " Adrift" when Atlantis goes missing. Dr. Lee remains stationed at Midway, training Kavanagh as his replacement, until the midway station is destroyed in " Midway". Dr. Lee is seen in Stargate Universe's pilot "Air" as Dr. Nicholas Rush (Robert Carlyle) uses the Ancient Communication stones (see Ancient technology in Stargate) to trade places with him. In "Twin Destinies," Eli Wallace switches bodies with Lee to present his plan for dialing the Stargate from within a star to Homeworld Command while Lee is presented the plan on ''Destiny''.
* Major Evan Lorne, (played by Kavan Smith, seasons 7 and 10) – A member of SG-11, Lorne first appears in ''Stargate SG-1'' episode " Enemy Mine". Lorne appears as the team leader of the SG-1 unit in an alternate universe in the ''SG-1'' season 10 episode "The Road Not Taken". Lorne reappears as a part of the new personnel sent after the Wraith siege by the ''Daedalus'' in the ''Stargate Atlantis'' episode "Runner". A natural carrier of the Ancient gene, Lorne becomes a major recurring character in ''Stargate Atlantis'', often acting as backup for John Sheppard and his team and seemingly Sheppard's second-in-command. Lorne's final appearance is in "Enemy at the Gate" where he joins Sheppard's team in boarding a hive ship orbiting the Earth in an attempt to destroy it from the inside.
* Doctor Carolyn Lam, (played by Lexa Doig, seasons 9–10) – Stargate Command's chief medical officer in seasons 9 and 10. She first appears in " Avalon Part 2" and is seemingly the first permanent one since the death of Dr. Janet Fraiser in season 7. Prior to joining Stargate Command, Dr. Lam worked with the Centers for Disease Control and Prevention; her specialty is infectious diseases. Dr. Lam has a strained relationship with her father, General Hank Landry. In " The Fourth Horseman", General Landry apologizes for not having been with her when she needed him as a child. Carolyn, her father and her mother Kim Lam, have dinner in the episode "Family Ties". Actress Lexa Doig is the real life spouse of Michael Shanks, who plays Daniel.

Recurring oversight agency characters

The NID is a shadowy intelligence agency that appears throughout the run of ''Stargate SG-1'' and occasionally on ''Stargate Atlantis''. The official mandate of the NID is to provide vital civilian oversight of top secret military operations, but one of their unofficial primary goals is to procure alien technologies. A set of well-resourced illegal cells named the Rogue NID uses unscrupulous methods to achieve the goals of the official NID and is later replaced by The Trust, a shady interplanetary terrorist group. The International Oversight Advisory (IOA) is a civilian oversight committee created after the United States and Russia revealed the existence of the Stargate Program to the other permanent members of the UN Security Council in season 6.

The producers initially wanted to call the NID "NRD" for "No Real Department", but went for "NID" because it sounded better. Although the acronym still stands for nothing in particular, the Stargate SG-1 Roleplaying Game says it stands for National Intelligence Department. When the producers came up with story ideas for the Trust, they found that '' Alias'' had used all the names they could think of. It was not until several weeks after they had decided on the name "Trust" that they found out that ''Alias'' had used that name as well. Faced with the choice to either go with the Trust or with what producer Joseph Mallozzi called "The Former Rogue Elements of the N.I.D. Now Working for Private Interests Bent on Global Domination", they chose the first option. The IOA has also been referred to as the "International Oversight Committee" on the show, until producer Joseph Mallozzi realized during the writing of " The Ties That Bind" that the acronym IOC is already used by the International Olympic Committee. The writers originally wanted to set up an IOA watchdog character on ''SG-1'' and possibly have Richard Woolsey on the base all the time, but season 9 already had so many new characters that the writers did not develop this idea.

Malcolm Barrett

Special agent Malcolm Barrett, (played by Peter Flemming, seasons 5–7, 9–10) – An NID agent introduced in season 5's " Wormhole X-Treme!". His first significant appearance follows in " Smoke & Mirrors", where he helps uncovering a shadow group behind the NID who tried to attribute Senator Kinsey's apparent assassination to O'Neill. After collaborating with SG-1 in season 7's " Heroes, Part 2" and "Resurrection", Barrett expresses a personal romantic interest in Samantha Carter in season 9's " Ex Deus Machina" and season 10's " Uninvited", but she rejects his advances. His last ''SG-1'' appearance is in season 10's "Dominion". Agent Barrett also recurs in ''Stargate Atlantis''. He warns General Landry in that show's season 2 episode "Critical Mass" of the Trust's plan to destroy Atlantis with a bomb, and aids several Expedition team members to track down Rodney McKay's sister Jeannie Miller on Earth in season 4's "Miller's Crossing".

Peter Flemming had a two-line audition for "Wormhole X-Treme" for a " Man in Black" character in a possible recurring role. Every NID character introduced before Agent Barrett "had been very shady, always had an agenda", and Barrett was "the first mainstay in NID who is actually law-abiding .. honest, nda good person".

Harry Maybourne

Colonel Harry Maybourne, (played by Tom McBeath, seasons 1–6, 8) – A USAF Colonel introduced in season 1's " Enigma" as an NID member with ambiguous morals and loyalties. In season 2's " Bane", Maybourne leads an NID attempt to claim Teal'c for study after alien insect infected Teal'c. After further antagonizing SG-1 through rogue NID operations in " Touchstone" and "Shades of Grey", and helping SG-1 in " Foothold", Maybourne flees to Russia and aids in establishing the Russian Stargate Program. He is caught in season 4's "Watergate", convicted of treason, and placed on death row. O'Neill contacts Maybourne in season 4's "Chain Reaction" to help reinstate General Hammond, who was blackmailed into resigning from his position. Maybourne escapes after the mission's success and covertly helps O'Neill in season 5's " Desperate Measures" and " 48 Hours" in the Adrian Conrad case. Maybourne tricks SG-1 into taking him off-world in season 6's "Paradise Lost", and is eventually exiled to a far-off planet. When SG-1 meets him again in season 8's " It's Good To Be King", Maybourne leads a life of leisure as the seemingly clairvoyant ruler of the local peoples, King Arkhan I. Although the people later discover the deception, they welcome him to stay as his technological expertise has improved their standard of life, and SG-1 returns to Earth without him. He had ascended to power using an Ancient time-travelers log of his journeys into the future of the planet and ended up facing a Goa'uld invasion, but the soldiers were repelled by Jackson and Teal'c with help from one of the villagers, and O'Neill destroyed in the ship in orbit, killing the System Lord behind the attack. When the team leave, O'Neill and Maybourne part amicably with Maybourne having finally accepted responsibility towards the people he was ruling.

After auditioning for the part as Harry Maybourne, the producers revealed that he "maybe" could get a spot as a recurring character in the show. McBeath called his role as Maybourne at the start of the series "boring", but was glad for the new change in the character's direction in the series after he was convicted for treason. McBeath also commented that the writers and the producers for the show had more "fun" when his character started to "loosen" up. When the portraying actor Tom McBeath was asked about the O'Neill–Maybourne relationship, he explained their rapport as "I can't stand you, but at some level I have a lot of respect for you. And I do actually, grudgingly have a good time when you're around, and things seem to work out." McBeath once stated that the character of Maybourne diminished after Richard Dean Anderson's departure from the show in season 8.

Robert Kinsey

Senator Robert Kinsey, (played by Ronny Cox, seasons 1, 4–8) – A US senator who first appears in season 1's "Politics". In "Politics", Kinsey ignores warnings of an imminent Goa'uld invasion and instead manages to briefly shut down Stargate Command for budget reasons, only for SG-1 to prove the program's worth and save Earth through defying orders. In season 4's "Chain Reaction", Kinsey and the NID temporarily succeed in controlling the Stargate by blackmailing General Hammond into retirement and appointing a new general to his position, but O'Neill is able to find evidence of the blackmail and get Hammond reinstated. In season 5's "2001", Kinsey aims to gain prestige through an alliance with the Aschen, but the alliance fails (However, the alliance went ahead in the alternate but unfulfilled future reality witnessed in season 4's "2010", in which Kinsey also achieved his goal of the presidency; only a warning from that future helped the SGC prevent it). In season 6's "Smoke and Mirrors", a group controlling the rogue NID, known as "the Committee", tries to assassinate Kinsey and frame Col. O'Neill for his murder, but NID agent Malcolm Barret and SG-1 foil this attempt. Kinsey becomes Vice-President in season 7's "Inauguration" and tries again to take control of the Stargate Program in "Lost City". Shortly after NID Agent Richard Woolsey presents incriminating evidence against Kinsey to President Henry Hayes in the same episode, Hayes "accepts" Kinsey's resignation. Kinsey makes his last appearance in season 8's " Full Alert", where the SGC convinces Kinsey to go undercover to undermine the hierarchy of the Trust. However, the Goa'uld have completely infiltrated the Trust through their operatives working outside of the solar system, and have already implanted a symbiote within Kinsey to aid in their plans of starting a nuclear war between the US and Russia. After the SGC foil the attempt, Kinsey flees aboard an Al'kesh, but Kinsey's future remains uncertain as the Al'Kesh is destroyed while he operated a transport device, leaving it open-ended if he was able to escape or the ship was destroyed before he could transport away. Kinsey is briefly mentioned as a President in the alternative timeline (with Hayes as Secretary of Defense) in season 8 finale " Moebius".

The producers of ''Stargate SG-1'' asked Ronny Cox if he would be interested in a role in one episode, but according to Cox it was "so much fun that they and I decided we would like to do more together". According to executive producer Brad Wright, every time they got a script from an outside editor, Kinsey was included. Cox has been noted for saying that the character has become a "Malevolent force on the show". Because of the collaboration between the producers and himself, Cox described him as a "self-aggrandizing senator who like to throw his weight around", and as "Kinsey feels that the Stargate sbeing used in completely the wrong way and one that is endangering American ideals and a way of life that he believes in" and a "Born-again, right-wing, Christian fundamentalist"; Cox played him as a heroic antagonist rather than villainous. Cox was approached by the producers to play Kinsey instead of auditioning himself. Kinsey holds the position of chairman of the Senate Appropriations Committee until season 7 and oversees the national defense budget of secret projects such as the Stargate Program.

Richard Woolsey

Richard Woolsey (played by Robert Picardo, seasons 7, 9–10) – Woolsey's first appearance is following the death of Dr. Janet Fraiser late in season 7 of ''Stargate SG-1'', Woolsey is brought into Stargate Command in the episode " Heroes" to examine the command decisions and threatens SGC personnel with court-martial if they do not cooperate. When Woolsey brings his report to President Hayes in "Inauguration", he comes to realize Senator Kinsey's ambitions and presents incriminating evidence against him, indirectly forcing Kinsey into resigning. Woolsey returns in the season 9 episode " Prototype" and encourages the SGC to take great risks with the captured Goa'uld-human-Ancient hybrid Khalek to learn more about the Ascension process. When the studies cause injury and death among SGC personnel, Woolsey acknowledges his own error and pleads for forgiveness from the SG-1 team. Being the US's representative on the newly formed International Oversight Advisory Committee (IOA), Woolsey and some colleagues are rescued by SG-1 and the crew of the ''Odyssey'' after a catastrophe at the Gamma Site in " The Scourge", which he later considers an "eye-opening experience". Woolsey makes two more appearances in " Flesh and Blood" and " Morpheus" and last appears on ''SG-1'' in season 10's " The Shroud". Woolsey remembers the Khalek incident and decides that Daniel, who transformed into a Prior, is too dangerous and must be placed indefinitely into stasis. However, Daniel frees himself before Woolsey's plans can be enacted.

Robert Picardo was in the main cast of '' Star Trek: Voyager'' from 1995 to 2001. He was familiar with ''Stargate SG-1'' from his time as a Showtime subscriber. He was offered a one-day guest star as Richard Woolsey for the ''SG-1'' episode " Heroes" in season seven (2004) while he was working on ''The Outer Limits'' in Vancouver (where ''Stargate SG-1'' is filmed). He was then brought back for the follow-up episode "Inauguration", which began the rehabilitation of the Woolsey character. With the story introduction of the IOA, the Woolsey character made more regular appearances to "annoy people". Eventually, humor was added to the role, and the character was spun over to ''Atlantis'' as a recurring guest character. Picardo later became a main character in ''Stargate Atlantis''. Producer Joseph Mallozzi said that "whenever I do interviews, I often draw parallels between manda Tapping and Robert Picardo They are both incredibly kind, professional, delightful to work with, and gifted actors who always elevate the performances of anyone they share a scene with."

Frank Simmons

Colonel Frank Simmons, (played by John de Lancie, seasons 5–6) – The NID liaison to Stargate Command after Col. Harry Maybourne's arrest for treason. Simmons is introduced in season 5's " Ascension" and is notorious for claiming to have the best interest of the nation at heart, while really he has his own political agenda. In " Desperate Measures", Simmons shoots O'Neill in the back while O'Neill was attempting to capture a Goa'uld who has taken Adrian Conrad as host. " 48 Hours" Simmons' involvement in the disappearance of the Adrian Conrad Goa'uld, whom he now holds captive, is revealed and General Hammond has him arrested. In season 6's "Prometheus", rogue NID agents hijack the unfinished starship ''Prometheus'' and demand that Simmons, along with Adrian Conrad's Goa'uld, be released. It later turns out that Simmons had orchestrated the entire affair. When Conrad is killed, the Goa'uld infects Simmons. O'Neill is able to open an emergency airlock and releases Simmons into hard vacuum, killing both him and the Goa'uld.

Other recurring characters

Chekov

Colonel Chekov, (played by Garry Chalk, seasons 5–6, 8–10) – Russia's liaison to Stargate Command following the early season 4 events of the short-lived Russian Stargate program. He first appears in season 5's " The Tomb", blaming SG-1 for the death of several Russian SG team members. Chekov collaborates with the SGC several episodes later in " 48 Hours", giving them a DHD from Russian possession and allowing the SGC to use the Russian Stargate. Colonel Chekov is appointed as the Russian envoy to the SGC around season 6's "Redemption" and agrees to give the Russian Stargate to the US in exchange for money, X-302 technology, and a Russian SG team. In season 6's " Disclosure", Colonel Chekov supports the US's presentation for the disclosure of the Stargate Program to the other three permanent members of the UN Security Council. In season 8's " Full Alert", Colonel Chekov helps General O'Neill deal with the possible Goa'uld compromise of the US government and establishes a direct line between O'Neill and the Russian President to avert a nuclear war. Chekov appears in season 9's " The Fourth Horseman" and " Crusade", where he has become a Russian representative of the IOA. He makes his last appearance in "Camelot" as the commander of the Earth ship ''Korolev'' to stop the Ori fleet from invading the Milky Way, but is killed when his ship was obliterated by the Ori Fleet, though six other crew members were transported from the ship before its destruction.

Garry Chalk was assigned to the role as Chekov by executive producer Michael Greenberg and N. John Smith. They asked him if he could speak Russian, Chalk replied "No." Greenberg then replied "No matter!" And gave him his own Russian coach named Alexander Kalugin, who made an appearance in the ''Stargate SG-1'' episode "Watergate" as one of the Russian soldiers. Portraying actor Chalk had previously worked with Richard Dean Anderson, Don S. Davis and Greenberg in 1986 on ''MacGyver'' and Smith in ''The Beachcombers''. Greenberg had said to Chalk that they were going to bring him into the show, at first there was no audition or a single phone call, until season 5 of the series. During the shows history, Chalk "Begged" the producers for his character to go through the "Stargate", but they said no, but, eventually they came up with the idea of giving him his own starship. Chalk was the only non-Russian actor assigned in " Flesh and Blood".

Catherine Langford

Catherine Langford, played by Kelly Vint (girl in the film), Viveca Lindfors (elderly lady in the film), Elizabeth Hoffman (elderly lady in season 1), Nancy McClure (young woman in season 1) and Glynis Davies (middle-aged woman in season 2), Ellie Gall ( Stargate Origins) – Daughter of archeologist Prof. Paul Langford who discovered the Stargate, as a girl she acquired an amulet depicting the Eye of Ra during the excavation of the Stargate in Giza in 1928. In present-day of ''Stargate'', she gives the amulet to Daniel before his first mission through the Stargate to Abydos. Her fiancé, a scientist named Ernest Littlefield (played by Keene Curtis and Paul McGillion), is the first human to have travelled through the Stargate since the ancient Egyptians buried it. Catherine and Ernest were separated by a gate incident in 1945 and were re-united in the mid-season 1 episode "The Torment of Tantalus", but Ernest is never seen again in the series (although he is mentioned in season 1s " There But For the Grace of God" and season 2's "The Fifth Race"). Catherine Langford appears again in alternate universes and times in " There But For the Grace of God" and "1969". Her death is announced in season 8's " Moebius, Part 1"; she leaves her personal collection of documents and artifacts, including the golden medallion of Ra, to Daniel Jackson.

Earth ship crew characters

In the show, Earth's efforts to construct starships of its own using reverse-engineered alien technology begin in the season 4 episode "Tangent", with the less-than-successful X-301. The first spaceworthy Earth fighter, the X-302 (later F-302), is introduced in season 6's "Redemption", and a few episodes later in "Prometheus", Earth's first space battlecruiser, the ''Prometheus''. Squadrons of F-302s are eventually stationed on Earth, Atlantis, the SGC's alternative sites, and its battlecruisers. In season 2 of ''Stargate Atlantis'', the ''Daedalus''-class battlecruiser is introduced, incorporating advancements that were tested on the ''Prometheus''. Six ''Daedalus''-class battlecruisers appeared in the franchise: the ''Daedalus'', the ''Odyssey'', the ''Korolev'', the ''Apollo'', the ''Sun Tzu'', and the ''George Hammond'' (named the ''Phoenix'' in an alternate timeline). Except for the ''Korolev'' and the ''Sun Tzu'', which are operated by the Russians and Chinese respectively, all Earth combat spacecraft are operated by the United States Air Force.

Set designer Peter Bodnarus based the design of the F-302 on the F-117A U.S. Air Force stealth fighter and the HL-10 aircraft from the 1970s, while still leaving the Goa'uld glider origins of the design recognizable. He and his team focused on creating a realistic-looking cockpit interior for the X-302 in terms of the headrest with overhead ejection handles and emergency systems. The original concepts for the look of the ''Prometheus'' as well as the X-303's interior were aircraft carriers. For the ''Prometheus'', the producers wanted to build something that was exactly the opposite of Goa'uld ships, which, according to Paul Mullie, are basically big empty rooms with nowhere to sit, no screens and no buttons to press. Andy Mikita thought the ''Prometheus'' was a fun set to shoot in because "there's lots of layers and textures and flashing lights".

* Catherine Womack, played by Chelah Horsdal (seasons 8–9) – A US Airforce officer of unknown rank. She takes over from Major Erin Gant as the helmsman of the ''Prometheus'' in season 8's in " New Order, Part 2" and is last seen in "Full Alert".
* Paul Emerson, played by Matthew Glave (seasons 9–10) – Introduced as the commander of the ''Odyssey'' in season 9's " Off the Grid", rescuing SG-1 and aiding in their mission to take back all stolen Stargates from Ba'al's ship. In the next episode, " The Scourge", he again rescues SG-1 and a team of the IOA from the Gamma Site. In the season 9 finale, "Camelot", Emerson teams up the ''Odyssey'' with many other ships of the Jaffa, the Asgard and the Lucian Alliance to battle the Ori battlecruisers which come through an open Supergate, and the ''Odyssey'' takes much damage. Emerson continues serving as the commander of the Odyssey in season 10 but is killed by a member of the Lucian Alliance in " Company of Thieves".
* Erin Gant, played by Ingrid Kavelaars (seasons 6–7) A US airforce Major and the first known helmsman of the ''Prometheus'' under Colonels Ronson and Kirkland as well as General George Hammond. She is first seen in " Memento" and last seen in "Lost City".
* Kevin Marks, played by Martin Christopher (seasons 9–10) – A USAF officer aboard the ''Prometheus'' introduced in " Avalon Part 1", helping Mitchell and SG-1 locate and gain access to the Ancient stronghold at Avalon. Marks is also present during the Kalana mission in "Beachhead" and the subsequent search for Gerak's hidden mothership in orbit of Earth's moon in " Ex Deus Machina", after which he is promoted to captain. Following the destruction of the ''Prometheus'' in " Ethon", Marks is promoted to major and becomes a bridge officer on board the ''Odyssey'', where he participates in various operations in "Camelot", " The Scourge, " Flesh and Blood", " Talion", and "Unending". Marks' last apparent ''SG-1'' mission on board the ''Odyssey'' is the retrieval of the Ark of Truth from the Ori Home Galaxy in '' Stargate: The Ark of Truth''. He takes a similar bridge position on board the ''Apollo'' in ''Atlantis'''s "Be All My Sins Remember'd" and transfers to ''Daedalus'' in "Search and Rescue". In "The Daedalus Variations," Teyla mentions that Marks gave her preliminary training on the battlecruiser's systems, an offer that Ronon Dex had declined. He is last seen on board the ''George Hammond'' under the command of Samantha Carter in ''Stargate: Universe's'' "Air." Aside from the commanders of each ship, Marks is the most recurring crewmember to appear and the only character shown to serve on each of ''Stargate's'' major space vessels.
* Lionel Pendergast, played by Barclay Hope (seasons 8–9) – Replaces Colonel William Ronson as commander of the ''Prometheus'' and is first seen in " New Order Part 2" patrolling Earth. Pendergast intercepts Thor's Asgard mothership ''Daniel Jackson'' after its arrival in Earth's solar system and destroys a Trust-controlled Al'kesh in " Full Alert". He is leading the search of Osiris's cloaked Al'kesh in Earth's orbit in "Endgame