A representative of an alien race that went through drastic evolution to survive its own climate change, Klaatu comes to Earth to assess whether humanity can prevent the environmental damage they have inflicted on their own planet. When barred from speaking to the United Nations, he decides humankind shall be exterminated so the planet can survive.

An alien and a robot land on earth after World War II and tell mankind to be peaceful or face destruction. A classic science fiction film from Robert Wise with an exceptional message.

An alien scout lands on earth in the year 1854. The creature is searching for water and food. Once it finds what it needs, it will call in an invasion fleet. A lone cowboy must stand against the alien invader or all will be lost.