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Duncan Macrae as Professor "Haywire" Hayman |
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Joseph Tomelty as Connell O'Grady aka Dan McEntee |
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Patrick Barr as Sir Archibald Asher |
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Charles Hawtrey as Adolphus Hayman |
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Diane Hart as Ada Shore |
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Robert Urquhart as Sheltie |
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Edward Lexy as Lord Carshennie |
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Jacqueline Mackenzie as Nellie Kelly |
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Eric Woodburn as The Bedellus |
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Molly Urquhart as Lady Duffy |
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Ronnie Corbett as Maither |
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Reginald Beckwith as Radio reporter |
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Russell Waters as Professor Baikie |
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Wendy Noel as Miss Mear |
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Roddy McMillan as Milligan |
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Alastair Hunter as Desk Sergeant |
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Andrew Downie as Student |
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Archie Duncan as Police Constable |
| Writing | Terry Bishop | Writer |
| Directing | Terry Bishop | Director |
| Writing | Reginald Beckwith | Writer |
| Writing | Lindsay Galloway | Adaptation |
| Writing | James Bridie | Theatre Play |
| Art | Ray Simm | Art Direction |
| Sound | Cedric Thorpe Davie | Music |
| Editing | Bernard Gribble | Editor |
| Production | Bill Kirby | Production Manager |
| Camera | Jo Jago | Director of Photography |
| Production | John Grierson | Executive Producer |
| Crew | John Baxter | Production Controller |
| Sound | Muir Mathieson | Conductor |
| Sound | George Burgess | Sound Supervisor |
| Camera | Arthur Graham | Camera Operator |
| Directing | Jack Causey | Assistant Director |
| Directing | Vega Stewart | Continuity |
| Directing | Barbara Cole | Continuity |
| Costume & Make-Up | Jimmy Evans | Makeup Artist |
| Costume & Make-Up | Amy Binney | Wardrobe Supervisor |
| Production | Barbara K. Emary | Associate Producer |
| Writing | Lindsay Galloway | Writer |
| Sound | Len Page | Sound Recordist |
| Production | Bob Jones | Production Assistant |
| Crew | J.F. Arnott | Technical Advisor |
