All Cast

Brian Donlevy

Brian Donlevy

Prof. Bernard Quatermass

John Longden

John Longden

Chief Inspector Lomax

William Franklyn

William Franklyn

Dr. Tom Brand

Bryan Forbes

Bryan Forbes

Marsh

Charles Lloyd Pack

Charles Lloyd Pack

Work Camp Manager Dawson

Tom Chatto

Tom Chatto

Vincent Broadhead, M.P.

John Van Eyssen

John Van Eyssen

The Plant Tour Guide

Sid James

Sid James

Jimmy Hall

Percy Herbert

Percy Herbert

Paddy Gorman

Michael Ripper

Michael Ripper

Ernie the Bartender

John Rae

John Rae

E. J. Macleod

Philipp Baird

Philipp Baird

Lab Assistant

Betty Impey

Betty Impey

Kelly

Joyce Adams

Joyce Adams

Woman Member of Parliament

Edwin Richfield

Edwin Richfield

Peterson

Vera Day

Vera Day

Sheila

Marianne Stone

Marianne Stone

Miss Beal

Jane Aird

Jane Aird

Mrs. McLeod

Michael Balfour

Michael Balfour

Harry

John Stuart

John Stuart

The Police Commissioner

John Fabian

John Fabian

Intern

George Merritt

George Merritt

Super

Barry Lowe

Barry Lowe

Chris (uncredited)