 | Richard Bailey als Lance Reardon |
 | Linda Stirling als Claire Forrest |
 | Roy Barcroft als Capt. Mephisto |
 | Kenne Duncan als Sidney Brand |
 | Forrest Taylor als Prof. William Forrest |
 | Forbes Murray als Prof. Harry Hargraves |
 | Jack Ingram als Edward Armstrong |
 | Harry Strang als Frederick "Fred" Braley |
 | Ed Cassidy als Paul Melton |
 | Frank Alten als John Raymond |
 | Lane Chandler als Police Insp. Reed |
 | Russ Vincent als Ruga |
 | Dale Van Sickel als Barker / Ritter / Lewis / Frazier / Sardon |
 | Tom Steele als Lyons / Bailey |
| Duke Green als Spencer Harvey |
| Wallace Grissell | Director |
| Theodore Lydecker | Special Effects |
| Harold Minter | Editor |
| Basil Dickey | Screenplay |
| Duke Green | Stunts |
| Joseph F. Poland | Screenplay |
| Eddie Parker | Stunts |
| Howard Lydecker | Special Effects |
| Babe DeFreest | Stunts |
| Ronald Davidson | Producer |
| Yakima Canutt | Director |
| Albert DeMond | Screenplay |
| Fred Graham | Stunts |
| Spencer Gordon Bennet | Director |
| Alan James | Screenplay |
| Dale Van Sickel | Stunts |
| Jesse Duffy | Screenplay |
| Grant Nelson | Screenplay |
| Cliff Bell Sr. | Editor |
| Tom Steele | Stunts |
| Duke Taylor | Stunts |
| Bud Thackery | Director of Photography |
| Mort Glickman | Original Music Composer |
| Ed Borschell | Sound |
| Richard Cherwin | Music Director |
| Ronald Davidson | Associate Producer |
| Charles S. Thompson | Set Decoration |
| Fred A. Ritter | Art Direction |
| R.G. Springsteen | Unit Manager |
