In the 1956 film Forbidden Planet, the crew finds the Krell remains on Altair IV.
Forbidden Planet is a science-fiction film directed by Fred M. Wilcox and loosely inspired by William Shakespeare’s The Tempest. A United Planets starship travels to Altair IV to investigate the fate of an earlier expedition. The surviving scientist, Dr. Edward Morbius, lives there with his daughter Altaira and the robot Robby.
The planet contains the ruins of the advanced Krell civilization. Their technology, especially the planetary machinery beneath the surface, becomes central to the film’s mystery. The Krell’s downfall is linked to the destructive manifestation of unconscious thoughts, giving the story a thematic connection to hidden forces escaping from containment, although it is not an adaptation of Pandora’s myth.
Altair IV is a fictional planet, not the real star Altair itself. Mars and Venus are real Solar System planets, while Tatooine belongs to Star Wars. The film is notable for its electronic score, pioneering visual effects, and Robby the Robot, who became an enduring science-fiction icon.