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Patrick Duffy as Mark Harris |
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Belinda Montgomery as Dr. Elizabeth Merrill |
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Kenneth Tigar as Dr. Miller Simon |
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Alan Fudge as C.W. Crawford |
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Tiffany Bolling as Lioa / Dilly |
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Annette Charles as Ginny Mendoza |
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Burr DeBenning as Xos / Chazz |
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Stanley Bennett Clay as Boy |
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Alan Mandell as Grant Stockwood |
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Hank Stohl as Sub Captain Wes |
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Russell Arms as Medical Examiner |
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Arch Archambault as Second Officer |
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Michael J. London as Air Lock Man |
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Vince Deadrick Sr. as Herb Wayland |
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Maurice Hill as Lou |
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Joel Lawrence as Hot Tub Manager |
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Maralyn Thoma as Myrtle |
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Dick Winslow as Fish Store Clerk |
| Directing | Marc Daniels | Director |
| Writing | Robert Lewin | Writer |
| Crew | Mayo Simon | Creator |
| Crew | Herbert F. Solow | Creator |
| Production | Robert H. Justman | Supervising Producer |
| Production | Robert Lewin | Producer |
| Production | Herbert F. Solow | Executive Producer |
| Sound | Fred Karlin | Music |
| Camera | Héctor R. Figueroa | Director of Photography |
| Editing | John Farrell | Editor |
| Editing | Gary Griffin | Editor |
| Production | Morris Chapnick | Casting Director |
| Art | Tracy Bousman | Art Direction |
| Art | Solomon Brewer | Set Decoration |
| Art | Charles Pierce | Set Decoration |
| Costume & Make-Up | Fred B. Phillips | Makeup Artist |
| Directing | Bruce Hanson | Assistant Director |
| Directing | Wes McAfee | Assistant Director |
| Directing | Steve Siporin | Second Assistant Director |
| Art | Robert M. Anderson | Property Master |
| Art | Bob McLing | Property Master |
