 | Jock Mahoney als Commander Harold 'Alan' Roberts |
 | Shirley Patterson als Margaret 'Maggie' Hathaway |
 | William Reynolds als Lt. Jack Carmen |
 | Henry Brandon als Dr. Carl Hunter |
 | Douglas Kennedy als Capt. Burnham |
 | Phil Harvey als Machinist's Mate Steve Miller |
 | Kenner G. Kemp als Officer at Briefing / Officer on Ship (uncredited) |
 | Bing Russell als Radio Operator (uncredited) |
 | Bert Stevens als Officer at Briefing (uncredited) |
| Virgil W. Vogel | Director |
| William N. Robson | Adaptation |
| László Görög | Screenplay |
| Charles Palmer | Story |
| William Alland | Producer |
| Ellis W. Carter | Director of Photography |
| Fred MacDowell | Editor |
| Alexander Golitzen | Art Direction |
| Richard H. Riedel | Art Direction |
| Bud Westmore | Makeup Artist |
| Russell A. Gausman | Set Decoration |
| Ray Jeffers | Set Decoration |
| Orien Ernest | Special Effects |
| Jack Kevan | Special Effects |
| Fred Knoth | Special Effects |
| Henry Mancini | Original Music Composer |
| Heinz Roemheld | Original Music Composer |
| Hans J. Salter | Original Music Composer |
| Herman Stein | Original Music Composer |
| Lew Schwartz | Assistant Camera |
| Lloyd Ward | Camera Operator |
| Roswell A. Hoffmann | Visual Effects |
| Nevada Penn | Wardrobe Master |
| Rollie Lane | Still Photographer |
| Joseph E. Kenney | Assistant Director |
