The line, "Gort, Klaatu barada nikto" is from which 20th century science fiction movie?

"Gort, Klaatu barada nikto" is a phrase that originated in the 1951 science fiction film "The 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 robot Gort. The robot will at that point not seek to destroy the Earth. After Gort has received the message, he will find and act to resurrect Klaatu from death.

"The Day the Earth Stood Still" is a USA black-and-white science fiction film that was released by 20th Century Fox. It was produced by Julian Blaustein and directed by Robert Wise. The film's screenplay was written by Edmund H. North. Ideas of the film's plot were based on the 1940 science fiction short story 'Farewell to the Master' by Harry Bates. To fully amplify the film, its music score was composed and incorporated by Bernard Herrmann.

Beside starring Rennie and Neal, the film featured Billy Gray as Bobby Benson, Hugh Marlowe as Tom Stevens, Sam Jaffe as Professor Jacob Barnhardt, Frances Bavier as Mrs. Barley, Lock Martin as Gort, and Frank Conroy as Mr. Harley. When released, "The Day the Earth Stood Still" was moderately successful at the domestic box office in the U.S. and Canada, accruing $1,850,000 in US dollars. The budget for the film was $995,000 dollars.