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Edward Connell as David Fielding |
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Barbara Hewitt as Susan Turner |
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Jack Woods as Asmodeus |
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Frank Bonner as Jim Hudson |
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Robin Christopher as Vicki |
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James Phillips as Reporter Sloan |
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Fritz Leiber Jr. as Dr. Arthur Watermann |
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Patrick Burke as Doctor Branson |
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Sharon Gray as Nurse |
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Louis Clayton as Old man in cave |
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Norvelle Brooks as |
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Irving L. Lichtenstein as |
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James Dwion as The Orderly |
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Forrest J. Ackerman as Doctor on Tape Recorder (voice) (uncredited) |
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Jack H. Harris as Detective Harrison (uncredited) |
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Chuck Niles as Reporter Sloan (voice) (uncredited) |
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Jim Duron as The Green Giant |
| Directing | Jack Woods | Director |
| Writing | Mark Thomas McGee | Story |
| Writing | Jack Woods | Screenplay |
| Camera | Ed Begley Jr. | Camera Operator |
| Sound | Bradley Lane | Sound Mixer |
| Sound | Jaime Mendoza-Nava | Original Music Composer |
| Production | Jack H. Harris | Producer |
| Production | Dennis Muren | Associate Producer |
| Camera | Mike Hoover | Director of Photography |
| Crew | Jim Danforth | Special Effects |
| Crew | David Allen | Special Effects |
| Crew | Dennis Muren | Special Effects |
| Production | Sam Altonian | Production Manager |
| Costume & Make-Up | Robynne Hoover | Makeup Artist |
| Editing | John Joyce | Editor |
| Sound | John Caper Jr. | Music Supervisor |
| Directing | Dennis Muren | Director |
