Two buddies head off for a summer holiday, but one of them has to take his sister along. She cramps their style when it comes to picking up chicks. However, they manage to have some fun.
| Actor | Role |
|---|---|
 Stéphane HillelPeter | Peter |
 Claus ObalskiFreddy / Victoria's brother | Freddy / Victoria's brother |
 Olivia PascalVicky / Freddy's sister | Vicky / Freddy's sister |
 Betty VergèsInes / Woman in red sports car | Ines / Woman in red sports car |
| EEdwige PierreKarin | Karin |
 Bea FiedlerHelga | Helga |
| CClaudine BirdFreddys Lehrerin / Freddy's teacher | Freddys Lehrerin / Freddy's teacher |
 Del NegroNot listed | Not listed |
 Gianni GarkoJacky / Playboy | Jacky / Playboy |
 Jacques HerlinLudwig | Ludwig |
 Otto RetzerPhilippe | Philippe |
 Renate LangerMädchen auf Parkplatz / Girl in parking lot | Mädchen auf Parkplatz / Girl in parking lot |
 Uschi ZechMädchen in Disco / Girl in disco | Mädchen in Disco / Girl in disco |
| GGesa ThomaDisco-Aufriss | Disco-Aufriss |
 Thomas GottschalkDiscjockey | Discjockey |