A Martian invader crashes his spaceship conveniently close to the workshop of a scientist who is developing an interplanetary craft. If the extraterrestrial Purple Monster can complete the rocket ship and return to Mars, he will be able to start a full-scale invasion of Earth. Good thing Craig Foster sets out to thwart the Monster's mission!
| Directing | Spencer Gordon Bennet | Director |
| Directing | Fred C. Brannon | Director |
| Writing | Royal K. Cole | Screenplay |
| Writing | Albert DeMond | Screenplay |
| Writing | Basil Dickey | Screenplay |
| Writing | Lynn Perkins | Screenplay |
| Writing | Joseph F. Poland | Screenplay |
| Writing | Barney A. Sarecky | Screenplay |
| Production | Ronald Davidson | Producer |
| Editing | Cliff Bell Sr. | Editor |
| Editing | Harold Minter | Editor |
| Costume & Make-Up | Bob Mark | Makeup Artist |
| Crew | Howard Lydecker | Special Effects |
| Crew | Theodore Lydecker | Special Effects |
| Crew | Polly Burson | Stunts |
| Crew | John Daheim | Stunts |
| Crew | Babe DeFreest | Stunts |
| Crew | Bud Geary | Stunts |
| Crew | Fred Graham | Stunts |
| Crew | Carey Loftin | Stunts |
| Crew | Cliff Lyons | Stunts |
| Crew | Tom Steele | Stunts |
| Crew | Dale Van Sickel | Stunts |
| Crew | Henry Wills | Stunts |
| Camera | Bud Thackery | Director of Photography |
| Sound | Mort Glickman | Original Music Composer |
| Sound | Ed Borschell | Sound |
| Sound | Richard Cherwin | Music Director |
