Aliens from the planet Centaur bring a capsule containing Commander Morton to Venus. They want to keep earth from invading their planet and kidnap Captain Crane in an attempt to bring the Seaview to their planet.
Did You Know?
When the alien first talks to Capt. Crane, it tells him that they are from "the double planet Centaur." This makes no sense; the actor presumably was supposed to say the "double star." See more