 | Kerwin Mathews als Jack |
 | Judi Meredith als Princess Elaine |
 | Torin Thatcher als Pendragon |
 | Walter Burke als Gama |
 | Don Beddoe als Imp |
 | Barry Kelley als Sigurd |
 | Dayton Lummis als King Mark |
 | Anna Lee als Lady Constance |
 | Roger Mobley als Peter |
 | Robert Gist als Scottish Captain |
 | Tudor Owen als Chancellor |
 | Ken Mayer als Boatswain |
| Herman Belmonte als Nobleman (uncredited) |
| Sam Harris als Party Guest (uncredited) |
 | Stuart Holmes als Celebration Guest (uncredited) |
| Richard LaMarr als Royal Court Member (uncredited) |
 | Jack Mower als Nobleman (uncredited) |
 | Monty O'Grady als Nobleman (uncredited) |
 | Bert Stevens als Celebration Guest (uncredited) |
| Helen Wallace als Jack's Mother (uncredited) |
| Nathan H. Juran | Director |
| Orville H. Hampton | Screenplay |
| Nathan H. Juran | Screenplay |
| Orville H. Hampton | Story |
| Edward Small | Producer |
| Robert E. Kent | Associate Producer |
| Paul Sawtell | Original Music Composer |
| Bert Shefter | Original Music Composer |
| David S. Horsley | Director of Photography |
| Grant Whytock | Editor |
| Fernando Carrere | Art Direction |
| Edward G. Boyle | Set Decoration |
| Dave Berman | Costume Design |
| Charles Gemora | Makeup Artist |
| Frank McCoy | Makeup Artist |
| Louise Miehle | Hairstylist |
| Ralph E. Black | Unit Production Manager |
| Ben Hersh | Production Supervisor |
| Augie Lohman | Special Effects |
| Howard A. Anderson | Visual Effects |
| Wah Chang | Visual Effects |
| Tim Baar | Visual Effects |
| Gene Warren | Visual Effects |
| Lloyd Vaughan | Animation |
| Bill Brace | Matte Painter |
| Jim Danforth | Visual Effects |
| Tom Holland | Visual Effects |
| Phil Kellison | Visual Effects |
| David Pal | Visual Effects |
