Bernard Quatermass
Brian Donlevy
Inspector Lomax
Jack Warner
Marsh (uncredited)
Maurice Kaufmann
Detective Sergeant Best (uncredited)
John Wynn
Little Girl (uncredited)
Jane Asher
The Chemist (uncredited)
Toke Townley
Maggie (uncredited)
Margaret Anderson
Maggie's Boyfriend (uncredited)
Eric Corrie
George (uncredited)
Henry B. Longhurst
Crash Site Fire Chief (uncredited)
Ernest Hare
Crash Site Fireman (uncredited)
Michael Godfrey
Central Clinic Nurse (uncredited)
Marianne Stone
Victor Carroon
Richard Wordsworth
Photo Lab Technician (uncredited)
John Kerr
Zookeeper (uncredited)
Bartlett Mullins
Zoo Superintendent (uncredited)
Mayne Lynton
Nurse Tucker (uncredited)
Barry Lowe
Mrs. Lomax (uncredited)
Jane Aird
Mother at Zoo (uncredited)
Molly Glessing
TV Show Floor Director (uncredited)
Arthur Gross
Sir Lionel Dean (uncredited)
Basil Dignam
TV Program Announcer (uncredited)
Donald Gray
Charles Greene (uncredited)
Gron Davies
Judith Carroon
Margia Dean
Ludwig Reichenheim (uncredited)
Stanley Van Beers
Sergeant Bromley (uncredited)
Arthur Lovegrove
Sound Engineer (uncredited)
James Drake
Rosie Wrigley
Thora Hird
BBC TV producer
Gordon Jackson
Gordon Briscoe
David King-Wood
Christie
Harold Lang
Blake
Lionel Jeffries
Police Sergeant Questioning Rosie
Sam Kydd
Director
Val Guest
Screenplay
Teleplay
Nigel Kneale
Richard H. Landau
Original Music Composer
James Bernard
Producer
Anthony Hinds
Editor
James Needs
Director of Photography
Walter J. Harvey
Makeup Artist
Philip Leakey
Art Direction
J. Elder Wills
Special Effects
Les Bowie
Music Director
John Hollingsworth
Sound Recordist
H. C. Pearson
Wardrobe Supervisor
Molly Arbuthnot
Assistant Director
Bill Shore
Hairstylist
Monica Hustler
Production Manager
T.S. Lyndon-Haynes