Jock MahoneyCommander Harold 'Alan' Roberts
Shirley PattersonMargaret 'Maggie' Hathaway
William ReynoldsLt. Jack Carmen
Henry BrandonDr. Carl Hunter
Douglas KennedyCapt. Burnham
Phil HarveyMachinist's Mate Steve Miller
Kenner G. KempOfficer at Briefing / Officer on Ship (uncredited)
Bing RussellRadio Operator (uncredited)
