The Day the Earth Stood Still
An alien lands and tells the people of Earth that they must live peacefully or be destroyed as a danger to other planets.
When a UFO lands in Washington, DC, bearing a message for Earth's leaders, all of humanity stands still. Klaatu (Michael Rennie) has come on behalf of alien life who have been watching Cold War-era nuclear proliferation on Earth. But it is Klaatu's soft-spoken robot, Gort, that presents a more immediate threat to onlookers. A single mother (Patricia Neal) and her son teach the world about peace and tolerance in this moral fable, ousting the tanks and soldiers that greet the alien's arrival. Robert Wise's 1951 film is considered by many critics and fans to be one of the greatest sci-fi movies of all time.