This Cold War-era classic is the bomb! Skip the Keanu Reeves reboot (a different kind of bomb) and catch Michael Rennie as a humanoid alien who visits Earth, assumes the alias Mr. Carpenter (carpenter!), and pleas for galactic peace. He's shot by the military, but resurrected by robot Gort before returning to the heavens. Perhaps the film's famous line "Klaatu barada nikto" is Gort-speak for "Peace on Earth."