Duncan Lamont

as Marius (uncredited)

as Karlstaad

as Supt. Simmons

as Ernest Defargue

as 3rd Engineer on Ship

as Dr. Saint

as John Williams

as Flight Sgt. Arthur

as Don Cope

as Detective Inspector Hilton

as Master-at-Arms

as Michael Shipton

as Dan Galloway

as Wilks

as Peter Purcell

as Tom Barker

as William Benton

as Divisional Supt. Smedd