After the summer holidays, Marion, Conny, Gaby, Jacqueline, and Uschi are on the train to Seeburg, where they attend boarding school. During the trip they meet trumpet-player Jochen and his band.
| Actor | Role |
|---|---|
 Marion MichaelMarion | Marion |
 Harald JuhnkeBandleader Jochen | Bandleader Jochen |
 Ursula HerkingInternatsleiterin Busenius | Internatsleiterin Busenius |
 Hubert von MeyerinckSchulrat | Schulrat |
 Hans RichterReferent Mayer | Referent Mayer |
 Walter GrossBarbesitzer Blatzmann | Barbesitzer Blatzmann |
 Ilse PagéConny | Conny |
 Margitta ScherrJacqueline | Jacqueline |
 Käte JaenickeAssistentin des Schulrats | Assistentin des Schulrats |
 Klaus DahlenMusiker Bud | Musiker Bud |
| EElke ArendtGaby | Gaby |