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