"An English professor decides that there are too many useless people in the world and invents a gas that will kill them off. But first they'll at least have a good laugh."
Leo McKern
as Professor Kerris Bowles-Ottery
Janet Munro
as Delia Brooks
Maxine Audley
as Clarinda Bowles-Ottery
Dennis Price
as Dr. John Hughes
Miles Malleson
as Dr. Woolley
Mervyn Johns
as Willie Pugh-Smith
Leonard Rossiter
as Dr. Fisher
Jennifer White
as TV Make-Up Girl
Patricia Jessel
as Mrs. Pugh-Smith
Duncan Macrae
as Dr. Brass
George Benson
as Inspector Butts
Ralph Michael
as Superintendent Rastleigh
Alan Wheatley
as Epicene
Wally Patch
as Tom Pike
Mark Dignam
as The Master
Jerome Willis
as Detective Inspector Armstrong
John Sharp
as Hodges
Lloyd Pearson
as Dr. Rossiter
Don Chaffey
Director
Robert Hamer
Writer
John Barry
Music
Gerald Gibbs
Director of Photography
Dennis Bertera
Assistant Director
Donald Taylor
Producer
Peter Tanner
Editor
Bill Blunden
Sound Editor
Screenplay
Barrie Melrose
Second Assistant Director
George Provis
Art Direction
H.L. Bird
Sound
C.E. Vulliamy
Novel