When Eric's niece Kathy becomes one of the heirs to a considerable fortune, her life (and those of the other heirs) is placed in jeopardy by the actions of a mysterious inter-loper.
| Actor | Role |
|---|---|
 Eric MorecambeEric | Eric |
 Ernie WiseErnie | Ernie |
 Fulton MackayMackay | Mackay |
 Lysette AnthonyKathy Chalmers | Kathy Chalmers |
 Margaret CourtenayDame Flora | Dame Flora |
 Kenneth HaighCousin Milton/Cousin Homer | Cousin Milton/Cousin Homer |
 Pamela SalemCousin Zelda | Cousin Zelda |
 Roger BrierleyChief Supt. Rivers | Chief Supt. Rivers |
 Edward JuddKnife Thrower | Knife Thrower |
| BBen ArisTheatre Manager | Theatre Manager |
 Tony BonczaJoe | Joe |
| FFrank CodaStage Manager | Stage Manager |
| BBig Mike CraneBig Jim | Big Jim |
 Tim SternTiny Big Jim | Tiny Big Jim |
 Robert LongdenVicar | Vicar |
| PPenny MeredithMrs Manzini | Mrs Manzini |
 Richard VernonUncle Felix | Uncle Felix |