In an idyllic Stockholm suburb, 11-year-old Lillebror Ström lives with his mum, dad, sister and grandma. When Alex, his sister, introduces her new boyfriend to the family, only Lillebror and his best pal Jens get suspicious. Is Slim Trim really that nice, and what's the deal with those shady friends of his? Meanwhile Lillebror's daddy Roland has financial troubles. Roland works at the Toy Museum, which is host to a gold exhibition. When the greatest gold heist in national history is exposed, Roland's in trouble, being the only one with access to the secret information about the museum's security system. Lillebror and Jens have to do something.
| Actor | Role |
|---|---|
 Kjell BergqvistRoland Ström | Roland Ström |
| DDaniel BragderydLillebror | Lillebror |
| HHelena Korsvallstorasyster Alex | storasyster Alex |
 Inga ÅleniusMärta, barnens mormor | Märta, barnens mormor |
| DDavid Schlein-AndersenJens | Jens |
 Karin BjurströmVeronika | Veronika |
 Rikard SvenssonNot listed | Not listed |
 Ivan Mathias PeterssonNot listed | Not listed |
| CConny AnderssonNot listed | Not listed |
 Svante GrundbergNot listed | Not listed |
| GGösta Hurtig-MöllerNot listed | Not listed |
| PPutte ElghNot listed | Not listed |
| WWilly KarlssonNot listed | Not listed |
| LLennart GustavssonNot listed | Not listed |
| HHelen VedleNot listed | Not listed |
| LLena SkogsbergNot listed | Not listed |
| CChrister FlodinNot listed | Not listed |
| MMartin ArwidssonNot listed | Not listed |
| JJarub BjurströmNot listed | Not listed |
| CChrister FredrikssonNot listed | Not listed |
| TThomas LindahlNot listed | Not listed |
| JJohan NybergNot listed | Not listed |
| CChristina Rothlin LöfqvistNot listed | Not listed |
| LLotta StamNot listed | Not listed |
| HHenrik TibblinNot listed | Not listed |