Brian Donlevy

Prof. Bernard Quatermass

John Longden

Chief Inspector Lomax

William Franklyn

Dr. Tom Brand

Bryan Forbes

Marsh

Charles Lloyd Pack

Work Camp Manager Dawson

Tom Chatto

Vincent Broadhead, M.P.

John Van Eyssen

The Plant Tour Guide

Sid James

Jimmy Hall

Percy Herbert

Paddy Gorman

Michael Ripper

Ernie the Bartender

John Rae

E. J. Macleod

Philipp Baird

Lab Assistant

Betty Impey

Kelly

Joyce Adams

Woman Member of Parliament

Edwin Richfield

Peterson

Vera Day

Sheila

Marianne Stone

Miss Beal

Jane Aird

Mrs. McLeod

Michael Balfour

Harry

John Stuart

The Police Commissioner

John Fabian

Intern

George Merritt

Super

Barry Lowe

Chris (uncredited)

Val Guest

Director

Nigel Kneale

Screenplay

Anthony Hinds

Producer

Michael Carreras

Executive Producer

James Bernard

Original Music Composer

Gerald Gibbs

Director of Photography

James Needs

Editor

Bernard Robinson

Art Direction

Philip Leakey

Makeup Artist

Val Guest

Screenplay

Nigel Kneale

Teleplay

Bill Warrington

Special Effects

Henry Harris

Special Effects

Frank George

Special Effects

John Hollingsworth

Music Director

Don Weeks

Assistant Director

Rene Coke

Wardrobe Supervisor

Anthony Nelson Keys

Production Supervisor

John Workman

Production Manager