Commander Harold 'Alan' Roberts

Jock Mahoney

Acting

Margaret 'Maggie' Hathaway

Shirley Patterson

Acting

Lt. Jack Carmen

William Reynolds

Acting

Dr. Carl Hunter

Henry Brandon

Acting

Capt. Burnham

Douglas Kennedy

Acting

Machinist's Mate Steve Miller

Phil Harvey

Acting

Officer at Briefing / Officer on Ship (uncredited)

Kenner G. Kemp

Acting

Radio Operator (uncredited)

Bing Russell

Acting

Officer at Briefing (uncredited)

Bert Stevens

Acting

Man at Briefing (uncredited)

Tom Coleman

Acting