 Tony CurtisFerdinand Waldo Demara Jr. / Martin Donner / Dr. Gilbert / Ben. W. Stone / Dr. Joseph Mornay / Robert Boyd Hammnd | Ferdinand Waldo Demara Jr. / Martin Donner / Dr. Gilbert / Ben. W. Stone / Dr. Joseph Mornay / Robert Boyd Hammnd |
 Karl MaldenFather Devlin | Father Devlin |
 Edmond O'BrienCapt. Glover - HMCS Cayuga | Capt. Glover - HMCS Cayuga |
 Arthur O'ConnellWarden J.B. Chandler | Warden J.B. Chandler |
 Gary MerrillPa Demara | Pa Demara |
 Joan BlackmanLt. Catherine Lacey | Lt. Catherine Lacey |
 Raymond MasseyAbbott Donner | Abbott Donner |
 Robert MiddletonR.C. Brown | R.C. Brown |
 Jeanette NolanMa Demara | Ma Demara |
 Sue Ane LangdonEulalie Chandler | Eulalie Chandler |
 Larry GatesCardinal | Cardinal |
 Mike KellinClifford Thompson | Clifford Thompson |
 Frank GorshinBarney | Barney |
 Cindi WoodWAC Lieutenant | WAC Lieutenant |
 Dick SargentHotchkiss | Hotchkiss |
 Robert Crawford Jr.Fred Demara Jr. (as Robert Crawford) | Fred Demara Jr. (as Robert Crawford) |
 Doodles WeaverFarmer Hauling Fertilizer | Farmer Hauling Fertilizer |
 Ward RamseyLieutenant Commander Howard - HMCS Cayuga | Lieutenant Commander Howard - HMCS Cayuga |
 David WhiteDr. Hammond | Dr. Hammond |
 Philip AhnCapt. Hun Kim | Capt. Hun Kim |
 Herbert RudleySenior Officer | Senior Officer |
 Jerry ParisDefense Lieutenant | Defense Lieutenant |
 Harry Carey Jr.Dr. Joseph Mornay | Dr. Joseph Mornay |
 Willard SageLt. Thornton | Lt. Thornton |
 Russ ConwaySgt. Wilkerson (uncredited) | Sgt. Wilkerson (uncredited) |
| JJames DobsonSailor (uncredited) | Sailor (uncredited) |
 Richard GainesState Official (uncredited) | State Official (uncredited) |
 Bob HerronHighway Patrol Officer (uncredited) | Highway Patrol Officer (uncredited) |
 Herbert LyttonReporter (uncredited) | Reporter (uncredited) |
 Frank MaxwellTirdell (uncredited) | Tirdell (uncredited) |
