| Don Megowan | ... | Captain Fathom | |
| Richard H. Cutting | ... | Professor Barclay (as Richard Cutting) | |
| Barbara Wilson | ... | Carol Barclay | |
| Kenneth Tobey | ... | Jack Clyde (as Ken Tobey) | |
| Rod Williams | ... | Derek Taylor | |
| David McMahon | ... | Duncan (as David Eden) | |
| Robert Sampson | ... | Gordon | |
| rest of cast listed alphabetically: | |||
| David McLean | ... | Seaman Duncan (uncredited) | |
Directed by | |||
| Maurice Kline | |||
| Gustav Della Valle | (underwater sequences) | ||
Writing credits | ||
| Curt Siodmak | (creator) & | |
| Thomas M. Dykers | (creator) (as Rear Adm. Thomas M. Dykers USN ret.) and | |
| Thomas M. Dykers | (creator) (as Rear Admiral Thomas M. Dykers USN Ret) | |
| Curt Siodmak | (screenplay) and | |
| William D. Holmes | (screenplay) | |
Produced by | |||
| Richard Kline | .... | executive producer | |
| Curt Siodmak | .... | producer | |
Cinematography by | |||
| Virgil Miller | |||
Film Editing by | |||
| Maurice Kline | |||
Art Direction by | |||
| Jack Okey | |||
Production Management | |||
| John Pommer | .... | production manager | |
Second Unit Director or Assistant Director | |||
| Gustav Della Valle | .... | assistant director: underwater sequences | |
| Sam Schneider | .... | assistant director | |
Other crew | |||
| Thomas M. Dykers | .... | technical consultant (as Rear Admiral Thomas M. Dykers USN {Ret}) | |
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| Sea Raiders | K-19: The Widowmaker | Never Say Never Again | Submarines: Sharks of Steel | Flying Disc Man from Mars |
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| Full cast and crew | Company credits | IMDb Adventure section |
| IMDb USA section |