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Joseph Cotten as Admiral |
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Lloyd Haynes as Lt. Dave Burston |
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Dewey Martin as Skip Langley |
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Leonard Nimoy as Comdr. Phil Kettenring |
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William Windom as Capt. Frank Reardon |
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Keenan Wynn as Orville Kelly |
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Malachi Throne as Dr. Dykers |
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Sam Elliott as Ens. William 'Bill' Sandover |
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Ivor Barry as Donald Ellington |
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Ron Masak as CPO Corky Schmidt |
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Gordon Hoban as Second Karp (False Karp) |
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Lee Stanley as Lt. Manners |
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David Thorpe as Lt. Benson |
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Henry Olek as Cab Driver |
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Dale Tarter as Clarence W. "CW" Karp (First Karp) |
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James Beach as Radar Operator |
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John Winston as English Scientist |
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Larry McCormick as Radio Operator |
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Paul Sears as Paine |
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Ellen Tucker as Mrs. Karp |
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Bill Keller as Shore Patrolman |
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Bobby Herbeck as Sonarman |
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Bo Johnson as Seaman |
| Directing | Marvin J. Chomsky | Director |
| Writing | Jackson Gillis | Writer |
| Production | James Nicholson | Unit Manager |
| Camera | Howard Schwartz | Director of Photography |
| Crew | John Burke | Special Effects |
| Production | Bruce Lansbury | Producer |
| Sound | Leith Stevens | Original Music Composer |
| Editing | Donald R. Rode | Editor |
| Production | Jim Merrick | Casting |
| Art | William L. Campbell | Art Direction |
| Art | Bill Ross | Supervising Art Director |
| Art | Pierre Ludlum | Set Decoration |
| Costume & Make-Up | Hal Lierley | Makeup Artist |
| Directing | Robert Birnbaum | Assistant Director |
| Crew | Edward K. Milkis | Post Production Supervisor |
| Production | Sam Strangis | Production Manager |
| Art | Ted Cook | Property Master |
| Sound | Dominick Gaffey | Sound Mixer |
| Sound | Doug Grindstaff | Supervising Sound Editor |
| Crew | Charlie Picerni | Stunts |
| Costume & Make-Up | Jan Kemp | Wardrobe Designer |
| Costume & Make-Up | Jennifer L. Parsons | Wardrobe Designer |
| Sound | Jack Hunsaker | Supervising Music Editor |
