| Ray Ballard | Tourist |
| Rick Beckner | Jock No. 2 |
| Brendan Burns | Jock No. I |
| Nobel Craig | Tim, snake man |
| Jim Drum | Actor |
| Michael Masters | Hawker |
| Ed McCready | Actor |
| Ralph Montgomery | Actor |
| Charles Seel | Old Man |
| Felix Silla | Seal Boy |
| Kathleen King | Kitty Stewart |
| Strother Martin | Dr. Carl Stoner |
| Tim O'Connor | Kogen |
| Richard B. Shull | Dr. Ken Daniels |
| Dirk Benedict | David Blake |
| Heather Menzies | Kristine |
| Jack Ging | Sheriff |
| Reb Brown | Steve Randall |
| Ted Grossman | Deputy |
Technical Credits
| Bernard Kowalski | Director |
| David Brown | Producer |
| Claire P. Brown | Set Decoration/Design |
| John Chambers | Makeup Special Effects |
| Hal Dresner | Screenwriter |
| Gerald Finnerman | Cinematographer |
| Nick Marcellino | Makeup |
| John T. McCormack | Art Director |
| Dan Striepeke | Original Story,Producer |
| Waldon O. Watson | Sound/Sound Designer |
| Robert Watts | Editor |
| Gordon A. Webb | Asst. Director |
| Patrick Williams | Score Composer |
| Richard D. Zanuck | Producer |
