Topic summary
Klaatu barada nikto
"Klaatu barada nikto" is a phrase that originated in the 1951 science fiction filmThe Day the Earth Stood Still. The humanoid alien protagonist of the film, Klaatu (Michael Rennie), instructs Helen Benson (Patricia Neal) that if any harm befalls him, she must say the phrase to the robotGort (Lockard Martin).
The Robot Hall of Fame describes the phrase as "one of the most famous commands in science fiction" and Frederick S. Clarke of Cinefantastique called it "the most famous phrase ever spoken by an extraterrestrial."