Klaatu, a stern-looking humanoid alien played by Michael Rennie, may look human, but it's clear he's alien from the way he moves and speaks, while his bodyguard, Gort, is a tall, imposing robot ...

however, he needs to assemble the world's greatest minds to hear his merciful warning and a definitive ultimatum. Is Klaatu the messenger of humanity's doom?

An alien (Klaatu) with his mighty robot (Gort) land their spacecraft on Cold War-era Earth just after the end of World War II. They bring an important message to the planet that Klaatu wishes to tell ...