 | Marilyn Hanold als Princess Marcuzan |
 | James Karen als Dr. Steele |
 | Lou Cutell als Dr. Nadir |
 | Nancy Marshall als Karen Grant |
| David Kerman als General Bowens |
| Robert Reilly als Col. Frank Saunders / Frankenstein |
 | Robert Alan Browne als Martian Crewmember (uncredited) |
| Robert Fields als Reporter (uncredited) |
 | Bruce Glover als Martian Crewmember / The Monster (uncredited) |
| Robert Gaffney | Director |
| John Alese | Makeup Artist |
| Saul Midwall | Director of Photography |
| Lawrence C. Keating | Editor |
| Anna Hill Johnstone | Costume Design |
| Robert McCarty | Producer |
| Maurice Rosenblum | Sound Director |
| Alan V. Iselin | Executive Producer |
| Stanley P. Darer | Associate Producer |
| George Garrett | Story |
