| Cast list | | Joseph Cotten | as | Admiral | | Lloyd Haynes | as | Lieutenant Dave Burston | | Dewey Martin | as | Skip Langley | | Leonard Nimoy | as | Commander Phil Kettenring | | William Windom | as | Captain Frank Reardon | | Keenan Wynn | as | Orville Kelly | | Malachi Throne | as | Dr. Dykers | | Sam Elliott | as | Ensign William 'Bill' Sandover | | Ivor Barry | as | Donald Ellington | | Ron Masak | as | CPO Corky Schmidt | | Gordon Hoban | as | Second Karp (False Karp) | | Lee Stanley | as | Lieutenant Manners | | David Thorpe | as | Lieutenant Benson | | Henry Olek | as | Cab Driver | | Dale Tarter | as | Clarence W. (CW) Karp (First Karp) |
| | Crew list: | | Marvin J. Chomsky (Director) | | Jackson Gillis (Writer) |
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