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Pier Angeli as Susan Lowry |
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Kerwin Mathews as Dr. Rick Torres |
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Jeff Morrow as Dr. John Willard |
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David Essex as Davido |
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Jerome Guardino as Johnny Caruso |
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Robert Warner as Steve Dodd |
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Norman Fields as Mort Stein |
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Jax Jason Carroll as Dr. Jameson |
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Wally Rose as Carlos |
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Buck Kartalian as Raul |
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Richard Cohen as Enrique |
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Samuel Peloso as Pedro |
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Read Morgan as The Octaman |
| Costume & Make-Up | Ron Kinney | Makeup Artist |
| Sound | Dick Damon | Sound |
| Production | Michael Kraike | Producer |
| Editing | Robert Freeman | Editor |
| Directing | Harry Essex | Director |
| Costume & Make-Up | Rick Baker | Costume Design |
| Writing | Harry Essex | Screenplay |
| Camera | Robert Caramico | Director of Photography |
| Camera | Robert Isenberg | Assistant Camera |
| Camera | John Caper Jr. | Still Photographer |
| Art | Bud Costello | Set Designer |
| Crew | Harry Walton | Special Effects Assistant |
| Production | Harry Essex | Co-Producer |
| Costume & Make-Up | George Barr | Costume Design |
| Costume & Make-Up | Doug Beswick | Costume Design |
| Directing | Elizabeth Leach | Script Supervisor |
| Production | Jax Jason Carroll | Production Manager |
