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Lloyd Bridges as Colonel Floyd Graham |
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Osa Massen as Dr. Lisa Van Horn |
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John Emery as Dr. Karl Eckstrom |
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Noah Beery Jr. as Major William Corrigan |
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Hugh O'Brian as Harry Chamberlain |
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Morris Ankrum as Dr. Ralph Fleming |
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Patrick Aherne as Reporter #1 |
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Sherry Moreland as Martian girl |
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John Dutra as Physician |
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Kathy Marlowe as Reporter |
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Tom Coleman as Reporter (uncredited) |
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James Conaty as Doctor Taking Lisa's Blood Pressure (uncredited) |
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Sam Harris as Reporter at Press Briefing (uncredited) |
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Judd Holdren as Reporter #3 (uncredited) |
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Stuart Holmes as Reporter (uncredited) |
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Barry Norton as Reporter (uncredited) |
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Cosmo Sardo as Reporter (uncredited) |
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Bert Stevens as Reporter (uncredited) |
| Sound | Ferde Grofé Sr. | Original Music Composer |
| Art | Theobold Holsopple | Production Design |
| Editing | Harry Gerstad | Editor |
| Costume & Make-Up | Don L. Cash | Makeup Artist |
| Production | Kurt Neumann | Producer |
| Directing | Kurt Neumann | Director |
| Writing | Kurt Neumann | Writer |
| Writing | Orville H. Hampton | Dialogue |
| Sound | Tom Lambert | Sound Engineer |
| Production | Betty Sinclair | Production Manager |
| Camera | Karl Struss | Director of Photography |
| Production | Mike Matney | Production Manager |
| Art | Clarence Steensen | Set Decoration |
| Crew | Lou Asher | Property Master |
| Crew | Frank Heath | Second Unit Cinematographer |
| Crew | Don Stewart | Special Effects |
| Directing | Frank Heath | Assistant Director |
| Production | Murray Lerner | Executive Producer |
