Prof. Bernard Quatermass

Brian Donlevy

Acting

Chief Inspector Lomax

John Longden

Acting

Dr. Tom Brand

William Franklyn

Acting

Marsh

Bryan Forbes

Directing

Work Camp Manager Dawson

Charles Lloyd Pack

Acting

Vincent Broadhead, M.P.

Tom Chatto

Acting

The Plant Tour Guide

John Van Eyssen

Acting

Jimmy Hall

Sidney James

Acting

Paddy Gorman

Percy Herbert

Acting

Ernie the Bartender

Michael Ripper

Acting

E. J. Macleod

John Rae

Acting

Lab Assistant

Philipp Baird

Acting

Kelly

Betty Impey

Acting

Woman Member of Parliament

Joyce Adams

Acting

Peterson

Edwin Richfield

Acting

Sheila

Vera Day

Acting

Miss Beal

Marianne Stone

Acting

Mrs. McLeod

Jane Aird

Acting

Harry

Michael Balfour

Acting

The Police Commissioner

John Stuart

Acting

Intern

John Fabian

Acting

Super

George Merritt

Acting

Chris (uncredited)

Barry Lowe

Acting