Gangsters try to steal Uuno Turhapuro's father-in-law's money by infiltrating into the family through Uuno, by pretending he has a long-lost son.
| Actor | Role |
|---|---|
 Vesa-Matti LoiriUuno Turhapuro | Uuno Turhapuro |
 Jukka PuotilaUrho Turhapuro | Urho Turhapuro |
 Tapio HämäläinenHugo Tuura | Hugo Tuura |
 Marita NordbergMrs. Tuura | Mrs. Tuura |
 Marjatta RaitaElisabeth Turhapuro | Elisabeth Turhapuro |
 Anu HälväNou | Nou |
| JJuha LaitilaNot listed | Not listed |
| JJukka LaaksonenNot listed | Not listed |
| JJoonas MyllyveräjäNot listed | Not listed |
 Simo SalminenSörsselssön | Sörsselssön |
 Elli CastrénUnelma Säleikkö | Unelma Säleikkö |
 Aarre KarénNot listed | Not listed |
| TTapani PerttuNot listed | Not listed |
| PPekka RätyViinanen | Viinanen |
 Tommi RinneNot listed | Not listed |
 Antti VirmavirtaNot listed | Not listed |
| PPetri LiskiNot listed | Not listed |
 Riitta VäisänenNot listed | Not listed |
| PPirre PasanenNot listed | Not listed |
 Spede PasanenHärski Hartikainen (uncredited) | Härski Hartikainen (uncredited) |