 | John Archer als Jim Barnes |
 | Warner Anderson als Dr. Charles Cargraves |
 | Tom Powers als General Thayer |
 | Dick Wesson als Joe Sweeney |
 | Erin O'Brien-Moore als Emily Cargraves |
 | Steve Carruthers als Businessman at Meeting (uncredited) |
 | Franklyn Farnum als Factory Worker (uncredited) |
 | Jack Gargan als Businessman at Meeting (uncredited) |
 | Everett Glass als Mr. La Porte (uncredited) |
 | Kenner G. Kemp als Businessman at Meeting (uncredited) |
 | Knox Manning als Himself (uncredited) |
| Mike Miller als Undetermined Secondary Role (uncredited) |
 | Irving Pichel als Off Screen Narrator of Woody Woodpecker Cartoon (voice) (uncredited) |
| Cosmo Sardo als Businessman at Meeting (uncredited) |
 | Grace Stafford als Woody Woodpecker (voice) (uncredited) |
 | Bert Stevens als Businessman at Meeting (uncredited) |
| Ted Warde als Brown (uncredited) |
| Alford Van Ronkel | Screenplay |
| George Pal | Producer |
| Irving Pichel | Director |
| Robert A. Heinlein | Screenplay |
| James O'Hanlon | Screenplay |
| George Sawley | Set Decoration |
| Leith Stevens | Original Music Composer |
| Lee Zavitz | Special Effects |
| Ernst Fegté | Production Design |
| Lionel Lindon | Director of Photography |
| Duke Goldstone | Editor |
