Story
In 20XX, Earth's ocean is taken over by a mysterious "ocean empire". The empire's military commander in chief, Hell Deathbird, demands that all shipping request his permission for sailing. Earth's only hope is the submarine called ''Super 99'', a mysterious submarine designed by Dr. Juzou Oki. The story begins as Japanese forces decided to investigate the mysterious threat beneath the ocean. Goro Oki gives his younger brother, Susumu, a rifle, a weapon modified fromCharacters
*Susumu Oki (沖 進(おき すすむ)) - Chief mechanic of SS-99. *Goro Oki (沖 五郎) - Deputy officer of Oki ocean lab. *Juzou Oki (沖 重造(おき じょうぞう)) - Head of Oki ocean lab. *Kizuku Oyama (大山 築(おおやま きづく)) - Captain of SS-99. *Miyuki Moriki (森木 深雪(もりき みゆき)) - SS-99 analyzer. *Torakichi Tanuki (田貫 虎吉(たぬき とらきち))- Deputy captain of SS-99.Ocean Empire
*Hell Deathbird (ヘル・デスバード) - Military leader of the Ocean Empire. He eventually took over the leadership of Ocean Empire. *Ze Strait (ゼ・ストレート) - Hell Deathbird's secretary. *Ze Stronestro (ゼ・ストロネストロ) - A Water World Men captain for Ze Stron and Ze Stroger. He also commanded the X-0 submarine. *Ze Stron (ゼ・ストロン) - Male agent working for Ze Stronestro. *Ze Stroger (ゼ・ストロガー) - Female agent working for Ze Stronestro. *Zelbert (ゼルベルト) - A military officer serving under Hell Deathbird. Later in the war, he planned to stage a coup again Deathbird, but failed. *Queen Ze Violencia (クイーン・ゼ・ヴィオレンシア) - Ruler of Ocean Empire. Her leader role was taken over by Hell Deathbird when he declared himself as emperor of Ocean Empire, resulting in Violencia's confinement. *Yanna (ヤーナ)Others
*Unidentified SS-99 couple - A male and a female SS-99 officers that resemble Susumu and Miyuki respectively, but with Water World Men skins. They appear in the epilogue section of episode 13, inside the space-bound SS-99.Vehicles
Japan
*''SS-99'' - The experimental submarine built underneath Oki's Ocean Lab. The ship was named after the family's type-99 rifle. SS-99 uses the experimental "L-type engine" that does not give off radiation. The phase 2 of L-type engine enables SS-99 to fly. 30 years after the war, SS-99 was upgraded to fly in space. *''Kairyumaru'' - Japanese survey ship in episode 1. She is slightly damaged by a near miss in episode 1 before returning to base. *''Kuroshio'' (黒潮) - A survey submarine carried by ''Kairyumaru''. *''Botao'' (波濤) - A ''Kongō'' class destroyer protecting ''Kairyumaru'' in episode 1; she is disabled by torpedo fired from a submarine of the Ocean Empire.Americe
*''K-6'' - A Diesel-powered training submarine; she is destroyed by ''X-187'' in episode 2.Ocean Empire
*''X-187'' - Submarine appeared in episode 2, and destroyed by SS-99 in episode 3. *''X-0'' - Submarine appeared in episode 3. *Z-type - A type of aircraft carrying submarine developed by Juzou Oki while working for Hell. *Emperor flagship (皇帝旗艦) - Hell Deathbird's flagship.Episodes
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