Benny Hill as Hugo Dill

Belinda Lee as Frankie Mayne

David Kossoff as Zacco

Garry Marsh as Det. Inp. Hancock

Denis Shaw as Professor Stumpf

Ernest Thesiger as Sir Walter

George Margo as Barakov

Frederick Schiller as Gruber

Thorley Walters as Raymond Courtney

Stratford Johns as PC Coleman

Warwick Ashton as PC Roberts

Norah Blaney as The Actress

Charles Hawtrey as Disc Jockey

Nicholas Phipps as Scientist

Peter Bull as Scientist

Gibb McLaughlin as Scientist

Ernest Jay as Scientist

Harold Scott as Scientist

Terence Alexander as Radio Show Official (uncredited)

Irene Handl as Customer (uncredited)

Arthur Lowe as Shop demonstrator (uncredited)

Glyn Houston as Arresting Policeman (uncredited)

Jeremy Hawk as Himself

Philip Stainton as Frankie's Agent