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