All Cast
Andrew Keir
Prof. Bernard Quatermass
James Donald
Dr. Mathew Roney
Barbara Shelley
Barbara Judd
Julian Glover
Colonel Breen
Bryan Marshall
Captain Potter
Maurice Good
Sergeant Cleghorn
Duncan Lamont
Sladden
Peter Copley
Howell
Edwin Richfield
Minister
Grant Taylor
Police Sergeant Ellis
Noel Howlett
Abbey Librarian
Thomas Heathcote
Vicar
Robert Morris
Jerry Watson
Bee Duffell
Miss Dobson
Sheila Steafel
Journalist
Hugh Futcher
Sapper West
Hugh Morton
Elderly Journalist
Hugh Manning
Pub Customer
June Ellis
Blonde
Keith Marsh
Johnson
James Culliford
Corporal Gibson
Roger Avon
Electrician
Brian Peck
Technical Officer
John Graham
Inspector
Charles Lamb
Newsvendor
David Savile
Army Officer
William Ellis
Journalist
Gareth Thomas
Workman (uncredited)
Elroy Josephs
Black Workman (uncredited)
Michael Poole
Older Workman (uncredited)