| Wesley Addy | ... | Commander Xeglon | |
| Robert Allen | |||
| Jack Bittner | |||
| Stewart Bradley | |||
| Augusta Dabney | ... | Captain Hurley's Wife | |
| Liam Dunn | |||
| Harry Hess | |||
| John Straub | |||
| Robert Webber | ... | Captain Bill Hurley | |
| Charles Welch |
| John Ericson | |||
| William A. Lee | |||
| Joe Mantell | |||
| Robert Paige | |||
| Rod Steiger | |||
| Howard Wierum |
| Casey Allen | |||
| Paul Anderson | ... | Rikud | |
| Russell Collins | |||
| Nancy Franklin | |||
| Wright King | |||
| Noel Leslie | |||
| Joseph Sweeney |
| Arthur Batanides | |||
| Ray Danton | |||
| Eddie Hyans | |||
| Jerry Paris | |||
| Wendell K. Phillips | (as Wendell Phillips) | ||
| Gene Saks | |||
| John Sylvester |
| Bethel Leslie | |||
| Leslie Nielsen | |||
| Joe Silver | |||
| Fred Stewart | |||
| Jack Weston |
| Jay Barney | |||
| Harry Cooke | (as Harry M. Cooke) | ||
| Logan Field | |||
| Eddie Hyans | |||
| David McKay | |||
| Herbert Nelson | |||
| John Raitt | |||
| Mary Sinclair |
| Dennis Alexander | |||
| Janie Alexander | |||
| John Boruff | |||
| Eileen Heckart | |||
| Mort Marshall | |||
| Richard McMurray |
| Ann Gillis | |||
| Robert P. Lieb | |||
| Robert Pastene | |||
| G. Albert Smith |
| Florence Anglin | |||
| Philip Bourneuf | |||
| Stewart Bradley | |||
| Logan Field | |||
| Peter Hobbs | |||
| John McGovern | |||
| Henry Worth |
| Leonard Barry | |||
| Arthur Batanides | |||
| Whit Bissell | |||
| Eddie Bruce | |||
| Allan Frank | |||
| Nancy Franklin | |||
| Bruce Hall | |||
| Julian Noa | |||
| Kim Stanley |
| Marc Cavell | (as Butch Cavel) | ||
| Joy Hilton | |||
| Dan Morgan | |||
| Robert Webber | |||
| Perry Wilson |
| Casey Allen | |||
| Herbert Berghof | |||
| Grant Gordon | |||
| Ernest Graves | |||
| Fred J. Scollay | (as Fred Scollay) | ||
| Robert F. Simon |