The Day the Earth Stood Still (1951)

The all time sci-fi classic. This is the story of an alien and his robot who come to Earth to warn us of the dangers of our ways. He warns that if we do not live peacefully we will be destroyed by the other beings in the universe. Of course the people of Earth are scared and do not want to listen to this alien man, Klaatu. He decides to try and blend in with humans and goes to live in a boarding house. Here he meets Helen and her son Bobby, who quickly becomes enamored of the man he knows as Carpenter. The alien must find out how to make the leaders of the world listen to him before it is to late. This is not a typical cheesy alien film like so many were in the 1950s. It has an interesting message and the cast is wonderful. A must see if you like alien or sci-fi films.