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Alastair Sim as Professor Ernst Kronak |
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Fred Emney as Sir George Denberry-Baxter |
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Edward Rigby as Timmy Tiverton |
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Oliver Wakefield as Sir Reginald Foxfield |
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Patricia Roc as Hope Ollerton |
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Annie Esmond as Lady Foxfield |
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Marian Spencer as Lady Shepshod |
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Olive Sloane as Daisy Barley |
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Maire O'Neill as Mrs. Mitterley |
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Gus McNaughton as Ketley |
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Charles Hawtrey as Young Orton |
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Peter Gawthorne as Major Shiptonthorpe |
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Aubrey Mallalieu as Commander Spofforth |
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G.H. Mulcaster as Inspector |
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Wally Patch as Sam |
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Horace Kenney as Walter Shepton |
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Morris Harvey as Jim Flagg |
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Ida Barr as Katie |
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Spencer Trevor as Colonel Hazelhead |
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Peter Ustinov as Dr. Bentika |
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Robert Atkins as Hassock |
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Diana Beaumont as Secretary |
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Syd Crossley as Uncle Alfred |
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A. Bromley Davenport as Agent |
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Charles Doe as Mayor |
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Alexander Field as Packles Junior |
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Ian Fleming as United Plastics Barrister |
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Richard George as Tom Largs |
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Leopold Glasspoole as Pelham |
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Michael Martin Harvey as Handover |
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W.T. Holland as |
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David Keir as Mr. Finningley |
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Henry B. Longhurst as Bald-headed Man with Blonde |
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Eliot Makeham as Town Clerk |
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George Merritt as Police Sergeant |
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Mignon O'Doherty as Dr. Buckley |
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Stan Paskin as Attendant |
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Maurice Rhodes as |
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Alan Tomkins as |
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Sam Wilkinson as |
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Joss Ambler as |
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Frank Atkinson as |
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Cecil Bevan as |
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Beckett Bould as |
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Laurence Hanray as |
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Raymond Lovell as |
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Arthur Maude as |
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Billy Merson as |
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Leonard Sharp as Doorman at 'Dog and Bell' |
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Robert Brooks Turner as |
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Charles Victor as |
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Jack Vyvyan as Police Constable |
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H Victor Weske as |
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Ben Williams as |
| Art | R. Holmes Paul | Art Direction |
| Sound | Kennedy Russell | Music |
| Writing | Barbara K. Emary | Writer |
| Writing | J. B. Priestley | Novel |
| Writing | John Baxter | Writer |
| Production | John Baxter | Producer |
| Costume & Make-Up | Maude Churchill | Costume Design |
| Directing | John Baxter | Director |
| Camera | James Wilson | Director of Photography |
| Writing | Geoffrey Orme | Writer |
