George Baker
— Prof. Gottlieb
Felicity Devonshire
— Cathy
Anna Bergman
— Suzy
Suzy Mandel
— Erica
Heather Deeley
— Marion
Peter Blake
— John
Queenie Watts
— John's mother
Hugh Lloyd
— John's father
Ian Hendry
— Uncle Rodney
Chet Townsend
— Nick
Johnny Vyvyan
— Jockey
Joyce Blair
— Beryl
Monika Ringwald
— Naked secretary
Norman Chappell
— Principal
Lindy Benson
— Blonde wife (as Linda Benson)
Forbes Collins
— Squire
Claire Davenport
— Fat stripper
Mary Millington
— Choir Girl (uncredited)
Edward Kalinski
— Benny
Maria St. Clare
— June
Martin Neil
— Joe
Barbara Eatwell
— Pigeon girl
Jonathan David
— Interrogator
John Benson
— Executive
Dudley Stevens
— Prisoner
Normaline
— Hazel (the maid)
Susan Glanville
— Frustrated housewife
Guy Standeven
— Psychiatrist
Steve Amber
— Imaginary lover
Peppi Borza
— Dancer