Brian Donlevy
Bernard Quatermass
Acting
Richard Wordsworth
Victor Carroon
Acting
David King-Wood
Gordon Briscoe
Acting
Jack Warner
Inspector Lomax
Acting
Margia Dean
Judith Carroon
Acting
Harold Lang
Christie
Acting
Lionel Jeffries
Blake
Acting
Thora Hird
Rosie Wrigley
Acting
Gordon Jackson
BBC TV producer
Acting
Sam Kydd
Police Sergeant Questioning Rosie
Acting
Maurice Kaufmann
Marsh (uncredited)
Acting
John Wynn
Detective Sergeant Best (uncredited)
Acting
Jane Asher
Little Girl (uncredited)
Acting
Toke Townley
The Chemist (uncredited)
Acting
Margaret Anderson
Maggie (uncredited)
Acting
Eric Corrie
Maggie's Boyfriend (uncredited)
Acting
Henry B. Longhurst
George (uncredited)
Acting
Ernest Hare
Crash Site Fire Chief (uncredited)
Acting
Michael Godfrey
Crash Site Fireman (uncredited)
Acting
Marianne Stone
Central Clinic Nurse (uncredited)
Acting
John Kerr
Photo Lab Technician (uncredited)
Acting
Bartlett Mullins
Zookeeper (uncredited)
Acting
Mayne Lynton
Zoo Superintendent (uncredited)
Acting
Barry Lowe
Nurse Tucker (uncredited)
Acting
Jane Aird
Mrs. Lomax (uncredited)
Acting
Molly Glessing
Mother at Zoo (uncredited)
Acting
Arthur Gross
TV Show Floor Director (uncredited)
Acting
Basil Dignam
Sir Lionel Dean (uncredited)
Acting
Donald Gray
TV Program Announcer (uncredited)
Acting
Gron Davies
Charles Greene (uncredited)
Acting
Stanley Van Beers
Ludwig Reichenheim (uncredited)
Acting
Arthur Lovegrove
Sergeant Bromley (uncredited)
Acting
James Drake
Sound Engineer (uncredited)
Acting