Billy is about to become the heir to a millionaire, provided that he is the only living heir. Complications arise quite soon when it turns out that Billy has three twin brothers who are also looking after heritage.
| Actor | Role |
|---|---|
 Björn GustafsonBilly och hans tvillingbröder | Billy och hans tvillingbröder |
 Ulf BrunnbergCharlie Barnet | Charlie Barnet |
 Meg WestergrenAmy Hardcastle | Amy Hardcastle |
 Stig GrybeJames | James |
 Suzanne ErnrupCynthia Hardcastle | Cynthia Hardcastle |
 Kent AnderssonJonathan Hardcastle | Jonathan Hardcastle |
 Gunilla ÅkessonWinnie | Winnie |
 Sven HolmbergArnold Piper | Arnold Piper |
| AAnders SundquistClifton Weaver | Clifton Weaver |