FORBIDDEN PLANET (1956)

An expedition is sent from Earth to Altair in the constellation of Aquilae (some 17 light years from Earth) to discover what happened to a colony of settlers on its fourth planet, Altair-4. What they discover (two survivors and a deadly secret that one of them has) is how and why an alien race of geniuses destroyed itself overnight while leaving their technology intact at some point in the distant, distant past. Director: Fred M. Wilcox. Cast: Walter Pidgeon, Anne Francis, Leslie Nielsen, Warren Stevens and Robby the Robot.