Benny Hill
Hugo Dill
Belinda Lee
Frankie Mayne
David Kossoff
Zacco
Garry Marsh
Det. Inp. Hancock
Denis Shaw
Professor Stumpf
Ernest Thesiger
Sir Walter
George Margo
Barakov
Frederick Schiller
Gruber
Thorley Walters
Raymond Courtney
Stratford Johns
PC Coleman
Warwick Ashton
PC Roberts
Norah Blaney
The Actress
Charles Hawtrey
Disc Jockey
Nicholas Phipps
Scientist
Peter Bull
Scientist
Gibb McLaughlin
Scientist
Ernest Jay
Scientist
Harold Scott
Scientist
Terence Alexander
Radio Show Official (uncredited)
Irene Handl
Customer (uncredited)
Arthur Lowe
Shop demonstrator (uncredited)
Glyn Houston
Arresting Policeman (uncredited)
Jeremy Hawk
Himself
Philip Stainton
Frankie's Agent