Robert BeattyBob Beacham | Bob Beacham |
Rona AndersonMary Game | Mary Game |
Clifford EvansTom Harmon | Tom Harmon |
| EEdward LexyDet. Insp. Charlton | Det. Insp. Charlton |
Olga LindoOlive Tavy | Olive Tavy |
| DDaphne PadelSelf - The Twenty Questions Team | Self - The Twenty Questions Team |
Jeanne De CasalisSelf - The Twenty Questions Team guest artiste | Self - The Twenty Questions Team guest artiste |
| JJack TrainSelf - The Twenty Questions Team | Self - The Twenty Questions Team |
| SStewart MacPhersonSelf - The Twenty Questions Team | Self - The Twenty Questions Team |
| NNorman HackforthSelf - The Twenty Questions Team 'Mystery Voice' | Self - The Twenty Questions Team 'Mystery Voice' |
| RRichard DimblebySelf - The Twenty Questions Team | Self - The Twenty Questions Team |
| HHarold ScottMaurice Emery KC | Maurice Emery KC |
Liam RedmondEcho News editor | Echo News editor |
| HHomi BodeMohammed Ali | Mohammed Ali |
Kynaston ReevesGen. Maitland | Gen. Maitland |
| SSonya O'SheaStewart MacPherson's secretary | Stewart MacPherson's secretary |
Frederick LeisterPolice Commissioner | Police Commissioner |
Wally PatchPolice Officer 'Tiny' White | Police Officer 'Tiny' White |
John SalewJohn Grimshaw | John Grimshaw |
Gordon McLeodRecord News editor | Record News editor |
| PPhilip KingCheshire Cheese waiter | Cheshire Cheese waiter |
Arthur YoungDoctor | Doctor |
Merle TottenhamMrs. Tavy's Neighbour (uncredited) | Mrs. Tavy's Neighbour (uncredited) |
| MMeadows WhiteFrederick 'Ricky' Tavey (uncredited) | Frederick 'Ricky' Tavey (uncredited) |