John Robinson

as Infantry General at Field Briefing (uncredited)

as Adm. Sir Bertram Ramsay (uncredited)

as Jason Douglas

as Pilot

as Lord Fawnlee

as Collings

as Prof. Martineau / Mansel

as Professor Bernard Quatermass

as Berkeley Reckitt

as Professor Gouin

as Unnamed Character

as Secretary

as Muller

as Sir Colenso Ridgeon

as Archdeacon Pomphret

as Old Ekdal

as Dr. Bruce Napier

as Linnett

as Dr. Braithwaite

as Lloyd Crichton

as Charles de Bouvet

as Hugh Turner

as Thomas Northon

as Quemot

as Old Lieutenant Ekdal

as Walter Bray

as Lord Sellington

as Edmund Newton

as Franz Von Markheim

as Dr. Saint

as Serjeant Sullivan KC