John Robinson

as Henry Errington

as Muller

as Muller (uncredited)

as Lord Fawnlee

as Old Lieutenant Ekdal

as Lord Sellington

as Quemot

as Collings

as Walter Bray

as Dr. Saint

as Old Ekdal

as Detective-Sergeant Leith

as Sir Michael Gerrard

as Charles de Bouvet

as Reverend Roger Leyland

as Edmund Newton

as Infantry General at Field Briefing (uncredited)

as Jason Douglas

as Sidney Fairweather

as Adm. Sir Bertram Ramsay (uncredited)

as Franz Von Markheim

as Professor Gouin

as Squire Dale

as Serjeant Sullivan KC

as Archdeacon Pomphret

as Hugh Turner

as Sir Colenso Ridgeon

as Lloyd Crichton

as Berkeley Reckitt

as Lloyd Crichton

as Detective Sergeant Leith

as Professor Bernard Quatermass

as Secretary

as Prof. Martineau / Mansel

as Dr. Braithwaite

as Linnett

as Thomas Northon

as Dr. Larry Parker

as Dr. Bruce Napier

as Oliver Farrant

as Unnamed Character

as Pilot

as Taylor

as Donald Scarlett