The Day the Earth Stood Still
Tags: anti war

Plot synopsis:
When a flying saucer lands in Washington, D.C., the Army quickly surrounds it. A humanoid (Michael Rennie) emerges, announcing that he has come in peace. When he unexpectedly opens a small device, he is shot by a nervous soldier. A tall robot emerges from the saucer and quickly disintegrates the soldiers' weapons. The alien orders the robot, Gort, to stop. He explains that the now-broken device was a gift for the President, which would have enabled him "to study life on the other planets".
The alien, Klaatu, is taken to Walter Reed Hospital. After surgery, he uses a salve to quickly heal his wound. Meanwhile, the Army is unable to enter the saucer; Gort stands outside, silent and unmoving.
Klaatu tells the President's secretary, Mr. Harley (Frank Conroy), that he has a message that must be delivered to all the world's leaders simultaneously. Harley tells him that such a meeting in the current political climate is impossible. Klaatu suggests that he be allowed to go among humans to better understand their "unreasoning suspicions and attitudes". Harley rejects the proposal, and Klaatu remains under guard.
Klaatu escapes and lodges at a boarding house as "Mr. Carpenter", the name on the dry cleaner's tag on a suit he "borrowed". Among the residents are young widow Helen Benson (Patricia Neal) and her son Bobby (Billy Gray). The next morning, Klaatu listens to the boarders speculate about why the alien is here.
While Helen and her boyfriend Tom Stephens (Hugh Marlowe) go out, Klaatu babysits Bobby. The boy takes Klaatu on a tour of the city, including a visit to his father's grave in Arlington National Cemetery; Klaatu learns that most of those buried there were killed in wars. The two visit the Lincoln Memorial, then the heavily guarded spaceship. Klaatu asks Bobby who is the greatest living person; Bobby suggests Professor Barnhardt (Sam Jaffe), who lives in the capital. Bobby takes Klaatu to Barnhardt's home, but the professor is absent. Klaatu adds an equation to a problem on Barnhardt's blackboard and leaves his contact information with the suspicious housekeeper.
That evening, a government agent takes Klaatu to Barnhardt. Klaatu explains that the people of other planets have concerns now that humanity has developed rockets and a rudimentary form of atomic power. Klaatu declares that if his message is ignored, "Earth will be eliminated". Barnhardt agrees to gather scientists from around the world at the saucer; he then suggests that Klaatu give a harmless demonstration of his power. Klaatu returns to his spaceship that night, unaware that Bobby has followed him. Bobby sees Gort knock out two sentries and Klaatu enter the saucer.
Bobby tells Helen and Tom what he saw, but they do not believe him until Tom takes a diamond he found in Klaatu's room to a jeweler and learns it is "unlike any other on Earth". Klaatu finds Helen at her workplace, and they take an empty service elevator, which stops precisely at noon. Klaatu reveals his true identity, then asks for her help. He has neutralized all electricity everywhere, except for such things as hospitals and aircraft in flight. Exactly 30 minutes later, the blackout ends.
After Tom informs the authorities of his suspicions, Helen breaks up with him. She and Klaatu go to Barnhardt's home. En route, he tells her that should anything happen to him, she must say to Gort, "Klaatu barada nikto". Their taxi is spotted and hemmed in; Klaatu makes a break for it and is shot dead. Helen quickly heads to the saucer. Gort disintegrates both sentries and advances on her. When Helen utters Klaatu's words, the robot carries her into the spaceship, then leaves to retrieve Klaatu's body. Gort brings Klaatu back to life, but he explains to Helen that his revival is only temporary; the power of life and death is "reserved for the Almighty Spirit".
Klaatu emerges from the saucer and addresses Barnhardt's assembled scientists, informing them that he represents an interplanetary organization that created a police force of invincible robots like Gort to "patrol the planets in spaceships like this one, and preserve the peace" by automatically annihilating aggressors. "In matters of aggression, we have given them absolute power over us. This power cannot be revoked." Klaatu concludes with, "It is no concern of ours how you run your own planet, but if you threaten to extend your violence, this Earth of yours will be reduced to a burned-out cinder. Your choice is simple: join us and live in peace, or pursue your present course and face obliteration". Klaatu and Gort reenter the spaceship and depart.