 Liam RedmondCmdr. Robert Brennan | Cmdr. Robert Brennan |
 André MorellSupt. Folland | Supt. Folland |
 Kenneth GriffithJimmy Ellis | Jimmy Ellis |
 Anthony BushellMaj. Elliott | Maj. Elliott |
 Mary MorrisAnna Braun | Anna Braun |
 Joan HicksonMrs. Ellis | Mrs. Ellis |
 Anthony NichollsGrant Mansfield | Grant Mansfield |
 Geoffrey KeenMorgan Williams | Morgan Williams |
 John BaileyStringer | Stringer |
 Patric DoonanGeorge Ellis | George Ellis |
 Dora BryanMrs. Bowers | Mrs. Bowers |
| SStuart LindsellCommissioner | Commissioner |
 John HarveyScotland Yard Man | Scotland Yard Man |
 Charles Lloyd PackPercy Ward | Percy Ward |
 Laurence NaismithReginald Gordon-Wells | Reginald Gordon-Wells |
 Jack McNaughtonBenson - Scotland Yard man | Benson - Scotland Yard man |
 Julian AmyesSlater | Slater |
 Alfie BassAlbert Brewer (uncredited) | Albert Brewer (uncredited) |
| HHélène BurlsMrs Skinner (uncredited) | Mrs Skinner (uncredited) |
| BBasil CunardPier Superintendant (uncredited) | Pier Superintendant (uncredited) |
 Harry FowlerStreet photographer (uncredited) | Street photographer (uncredited) |
 Everley GreggMrs Finch-Harvey - Music Club member (uncredited) | Mrs Finch-Harvey - Music Club member (uncredited) |
| GGeorge HilsdonDetective (uncredited) | Detective (uncredited) |
 Glyn HoustonRailway shunter (uncredited) | Railway shunter (uncredited) |
 Douglas IvesMr Mathews - Union Rep (uncredited) | Mr Mathews - Union Rep (uncredited) |
 Moultrie KelsallShip's Captain (uncredited) | Ship's Captain (uncredited) |
 Sam KyddSam - Printer (uncredited) | Sam - Printer (uncredited) |
 Victor MaddernAnarchist (uncredited) | Anarchist (uncredited) |
 Julien MitchellMr Philips - Union Rep (uncredited) | Mr Philips - Union Rep (uncredited) |
 Julian SomersScottish Police Sergeant (uncredited) | Scottish Police Sergeant (uncredited) |
