Helter Skelter

Carol Marsh

— Susan Graham

David Tomlinson

— Nick Martin

Mervyn Johns

— Ernest Bennett

Richard Hearne

— Professor Pastry

Terry-Thomas

— Self

Jimmy Edwards

— Dr. Edwards

Peter Hammond

— Spencer Stone

Jon Pertwee

— Headwaiter

Wilfrid Hyde-White

— Dr. B. Jekyll

Peter Haddon

— Major Basil Beagle

Geoffrey Sumner

— Humphrey Beagle

Zena Marshall

— Giselle

Colin Gordon

— Chadbeater Longwick

Judith Furse

— Mrs. Martin

Edmund Willard

— Ezekial

Robert Lamouret

— The 'Duck' Man

Henry Kendall

— Lord Bruce Carlton

Bill Fraser

— Oliver Cromwell

Shirl Conway

— Cabaret Star

George Benson

— Temporary Waiter

Sandra Dorne

— Receptionist

Patricia Raine

— Amber

Ronald Adam

— Director General of the BBC (uncredited)

Michael Balfour

— Barman (uncredited)

Johnny Briggs

— BBC Page Boy (uncredited)

Esma Cannon

— Autograph Huntress (uncredited)

Cyril Chamberlain

— (uncredited)

Andrew Crawford

— First BBC Announcer (uncredited)

Valentine Dyall

— Man Telling Story at BBC (uncredited)

Danny Green

— Liftman (uncredited)