Alastair Sim
— Professor Ernst Kronak
Fred Emney
— Sir George Denberry-Baxter
Edward Rigby
— Timmy Tiverton
Oliver Wakefield
— Sir Reginald Foxfield
Patricia Roc
— Hope Ollerton
Annie Esmond
— Lady Foxfield
Marian Spencer
— Lady Shepshod
Olive Sloane
— Daisy Barley
Maire O'Neill
— Mrs. Mitterley
Gus McNaughton
— Ketley
Charles Hawtrey
— Young Orton
Peter Gawthorne
— Major Shiptonthorpe
Aubrey Mallalieu
— Commander Spofforth
G.H. Mulcaster
— Inspector
Wally Patch
— Sam
Horace Kenney
— Walter Shepton
Morris Harvey
— Jim Flagg
Ida Barr
— Katie
Spencer Trevor
— Colonel Hazelhead
Peter Ustinov
— Dr. Bentika
Robert Atkins
— Hassock
Diana Beaumont
— Secretary
Syd Crossley
— Uncle Alfred
A. Bromley Davenport
— Agent
Charles Doe
— Mayor
Alexander Field
— Packles Junior
Ian Fleming
— United Plastics Barrister
Richard George
— Tom Largs
Leopold Glasspoole
— Pelham
Michael Martin Harvey
— Handover