Four scientists and a newsman crash land on Mars and meet martians who act friendly.
| Actor | Role |
|---|---|
 Arthur FranzDr. Jim Barker | Dr. Jim Barker |
 Virginia HustonCarol Stafford | Carol Stafford |
 Cameron MitchellSteve Abbott | Steve Abbott |
 John LitelDr. Lane | Dr. Lane |
 Richard GainesProf. Jackson | Prof. Jackson |
 Morris AnkrumIkron | Ikron |
 Marguerite ChapmanAlita | Alita |
| LLucille BarkleyTerris | Terris |
 Robert BarratTillamar | Tillamar |
 Edward EarleJustin (uncredited) | Justin (uncredited) |
 William ForrestGeneral (uncredited) | General (uncredited) |
 David BondRamay (uncredited) | Ramay (uncredited) |
 Stanley BlystoneCouncilman (uncredited) | Councilman (uncredited) |
 Tristram CoffinCommentator (uncredited) | Commentator (uncredited) |
 Everett GlassMontar (uncredited) | Montar (uncredited) |
 Trevor BardetteAlzar (uncredited) | Alzar (uncredited) |