The Day the Earth Stood Still

 "The Day the Earth Stood Still" is a 1951 American science fiction film directed by Robert Wise and starring Michael Rennie, Patricia Neal, and Hugh Marlowe.

The story revolves around an extraterrestrial humanoid named Klaatu (Michael Rennie) who arrives on Earth with his powerful robot companion, Gort, in a flying saucer. Their mission is to deliver a message of peace and goodwill to the people of Earth. However, Klaatu's arrival sparks fear and panic among the world's leaders and military forces.

After being shot and injured by a nervous soldier, Klaatu takes refuge in the home of a widowed woman named Helen Benson (Patricia Neal) and her young son, Bobby (Billy Gray). Under the alias Mr. Carpenter, Klaatu observes human behavior and attempts to convey his message of peace, but he is met with suspicion and hostility.

As tensions escalate and Klaatu's true identity is revealed, he warns humanity of the consequences of their violent and self-destructive behavior. The film's iconic line, "Klaatu barada nikto," is spoken by Helen Benson to Gort, instructing him to spare humanity from destruction.

"The Day the Earth Stood Still" is considered a classic of the science fiction genre and has been praised for its groundbreaking special effects, atmospheric direction, and Michael Rennie's compelling performance as the enigmatic Klaatu.