Donald Houston

as Christiansen

as Tony Warren

as Lieutenant Weston

as Dr. Francis

as Tom Penney

as Group Captain Don Barrett

as Dr. Alex Waring

as Hilliard

as Charles Soames

as Dr. Sanderson

as Capt. Roger Byfold

as RAF Pilot

as Tony Erickson

as Richter

as Arthur Wellard

as Edmund Bierce

as Commander Denning

as Lockier

as Fielding

as John Burnham

as The Onlooker

as Bobby Lowther

as Lavalette