Forbidden Planet (1956)
A starship crew in the 23rd century goes to investigate the silence of a distant planet's colony, only to find just two survivors, a powerful robot, and the deadly secret of a lost civilization.
This is the OG sci-fi film about a space-faring human society.
Can you really be a fan of sci-fi, if you haven't witnessed Robby the Robutt in all his original cinematic glory?