Cast from The Land Unknown

Jock Mahoney

Commander Harold 'Alan' Roberts

Shirley Patterson

Margaret 'Maggie' Hathaway

William Reynolds

Lt. Jack Carmen

Henry Brandon

Dr. Carl Hunter

Douglas Kennedy

Capt. Burnham

Phil Harvey

Machinist's Mate Steve Miller

Kenner G. Kemp

Officer at Briefing / Officer on Ship (uncredited)

Bing Russell

Radio Operator (uncredited)

Bert Stevens

Officer at Briefing (uncredited)