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Lloyd Bridges as Dr. Doug Standish |
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Brian Kelly as Dr. Craig Mosby |
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Shirley Eaton as Dr. Margaret E. 'Maggie' Hanford |
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David McCallum as Dr. Philip Volker |
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Keenan Wynn as Hank Stahl |
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Marshall Thompson as Dr. Orin Hillyard |
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Gary Merrill as Dr. August 'Gus' Boren |
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Ron Hayes as Brinkman |
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George Shibata as Prof. Uji Hamaru |
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Donald Linton as Vice President |
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Frank Logan as Captain of the Diligence |
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Don Wells as Sonar Man on the Dilligence |
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Celeste Yarnall as Secretary |
| Directing | Andrew Marton | Director |
| Writing | Arthur Weiss | Writer |
| Visual Effects | Jim Danforth | Visual Effects |
| Production | Andrew Marton | Producer |
| Art | Max Pittman | Set Decoration |
| Production | Ivan Tors | Producer |
| Art | Preston Rountree | Art Direction |
| Sound | Harry Sukman | Original Music Composer |
| Camera | Clifford H. Poland Jr. | Director of Photography |
| Editing | Warren Adams | Editor |
| Art | Mel Bledsoe | Art Direction |
| Writing | Art Arthur | Writer |
| Production | Ben Chapman | Associate Producer |
