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