Peter Sellers
The Rev. John Smallwood
Cecil Parker
Archdeacon Aspinall
Isabel Jeans
Lady Despard
Ian Carmichael
The Other Smallwood
Bernard Miles
Simpson
Brock Peters
Matthew Robinson
Eric Sykes
Harry Smith
Irene Handl
Rene Smith
Miriam Karlin
Winnie Smith
Joan Miller
Mrs Smith-Gould
William Hartnell
Major Fowler
Roy Kinnear
Fred Smith
John Harvey
Wilson, Prison Officer
Joan Hickson
Housewife
Eric Barker
Bank Manager
John Comer
Butcher
Kenneth Griffith
Rev. Owen Thomas
Mark Eden
Sir Geoffrey Despard
Basil Dignam
Prison Governor
Colin Gordon
Prime Minister
Geoffrey Hibbert
Council Official
Ludovic Kennedy
Himself
Malcolm Muggeridge
Cleric
Harry Locke
Shop Steward
Derek Nimmo
DG Assistant
Conrad Phillips
Deaf Man
Miles Malleson
Bishop Rockeby
Nicholas Phipps
DG
Thorley Walters
Tranquilax Executive
Marianne Stone
Miss Palmer
Cardew Robinson
Tramp
Gerald Sim
Store Manager
Anna Wing
Housewife (uncredited)
John Junkin
Reporter at Space Launch Site (uncredited)
Rodney Bewes
Milkfloat Driver (uncredited)
Steve Marriott
Jack (uncredited)
Louis Mansi
Man Buying Groceries (uncredited)
Jack Carter
Launch Site Worker (uncredited)