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Chief Warrant Officer Sam Jacobs (Jack Kruschen), Dr. Iris Ryan (Nora Hayden), Professor Theodore Gettell (Les Tremayne) and Col. Tom O'Bannion (Gerald Mohr) are astronauts aboard the spaceship MR-1, the first mission to Mars. Shortly after their rocket reaches the mysterious red planet, the band of brave space explorers discovers monstrous yet highly intelligent alien life... Wikipedia