 Conrad VeidtCapt. Andersen | Capt. Andersen |
 Valerie HobsonMrs. Sorensen | Mrs. Sorensen |
 Hay PetrieAxel Skold | Axel Skold |
 Joss AmblerLt. Cmdr. Ashton | Lt. Cmdr. Ashton |
 Raymond LovellVan Dyne | Van Dyne |
 Esmond KnightMr. Pidgeon | Mr. Pidgeon |
 Charles VictorHendrick | Hendrick |
| PPhoebe KershawMiss Lang | Miss Lang |
 Harold WarrenderLt. Cmdr. Ellis | Lt. Cmdr. Ellis |
 John LongdenPassport officer | Passport officer |
 Eric MaturinPassport officer | Passport officer |
| DDennis ArundellLieman | Lieman |
| MMolly Hamley-CliffordBaroness Hekla | Baroness Hekla |
| EEric BerryMr. Abo | Mr. Abo |
| PPaddy BrowneSinger in 'Regency' | Singer in 'Regency' |
| HHenry WolstonFirst Danish Waiter | First Danish Waiter |
| JJulian VedeySecond Danish Waiter | Second Danish Waiter |
| SSydney MonctonThird Danish Waiter | Third Danish Waiter |
| HHamilton KeeneFourth Danish Waiter | Fourth Danish Waiter |
 Leo GennFirst Brother Grimm | First Brother Grimm |
 Stuart LathamSecond Brother Grimm | Second Brother Grimm |
 Peter BullThird Brother Grimm | Third Brother Grimm |
 Olga EdwardesMrs. Abo | Mrs. Abo |
| TToni GableMiss Karoly | Miss Karoly |
| DDesmond JeansFirst Karoly | First Karoly |
| EEric HalesSecond Karoly | Second Karoly |
| JJ.P. RobertsHanson | Hanson |
 Manning WhileyManager of 'Mousetrap' | Manager of 'Mousetrap' |
 Frank AllenbyNot listed | Not listed |
 Patrick BarrUndetermined Role (uncredited) | Undetermined Role (uncredited) |
