Dickie Dreadnought is the boxing-mad nephew of pious clergyman Reverend Sydney Mullet. To mollify his disapproving uncle, Dickie embarks on an elaborate plan to keep his budding boxing career a secret, with he and his tough-talking promoter Wally Burton both pretending to be devout 'men of the cloth'.
| Actor | Role |
|---|---|
 Brian RixDickie 'Dreadnought' Marchant | Dickie 'Dreadnought' Marchant |
 William HartnellWalter 'Wally' Burton | Walter 'Wally' Burton |
 Tommy CooperHorace Hawkins | Horace Hawkins |
 Vera DayCynthia Tripp | Cynthia Tripp |
 Sidney JamesSammy Gatt | Sammy Gatt |
 Tony WrightPercy Gibbons | Percy Gibbons |
| LLeo FranklynRev. Sydney Mullet | Rev. Sydney Mullet |
 John RobinsonArchdeacon Pomphret | Archdeacon Pomphret |
 Renée HoustonMildred Pomphret | Mildred Pomphret |
 Arthur MullardTubby | Tubby |
 Terry ScottPolice Constable | Police Constable |
 Shirley Anne FieldIris Collins | Iris Collins |
 Dick BentleyGeorge Nibbs | George Nibbs |
 Miles MallesonBishop | Bishop |
 Ronald AdamTrout (as Ronald Adams) | Trout (as Ronald Adams) |
| RRupert EvansButch | Butch |
| LLarry TaylorChappy Tuck | Chappy Tuck |
 Tommy DugganMike | Mike |
| GGeorge LeechJake | Jake |
| Terry ScottPoliceman | Policeman |
| LLindsay HooperBert Bender | Bert Bender |
| JJean ClarkeManicurist (as Jean Clark) | Manicurist (as Jean Clark) |
| JJennifer PhippsSecretary | Secretary |