The third form of a boarding school and the students of a neighboring school do not get along. Each side dreams up the craziest pranks to defeat the other. And when one day the high school students go as far as stealing the Gymnasium students’ essays and even burning them, daily school life really gets out of hand.
| Actor | Role |
|---|---|
 Paul DahlkeJustus | Justus |
 Heliane BeiSchwester Beate | Schwester Beate |
 Paul KlingerDer Nichtraucher | Der Nichtraucher |
 Peter VogelDer schöne Theodor | Der schöne Theodor |
| PPeter TostMartin | Martin |
| BBert BrandtMatz | Matz |
| KKnut MahlkeUli | Uli |
| HHerbert KrollDir.Grünkern | Dir.Grünkern |
 Erich PontoSanitätsrat Dr. Hartwig | Sanitätsrat Dr. Hartwig |
 Bruno HübnerProf. Kreuzkamm | Prof. Kreuzkamm |
 Rudolf VogelFriseur Krüger | Friseur Krüger |
 Willy ReichertHerr Thaler, Martins Vater | Herr Thaler, Martins Vater |
 Ruth HausmeisterMartins Mutter | Martins Mutter |
| AArno EbertJohnnys Vater | Johnnys Vater |
 Peter KrausJohnny | Johnny |
 Michael VerhoevenFerdinand | Ferdinand |
| AAxel ArensSebastian | Sebastian |
 Erich KästnerAutor (uncredited) | Autor (uncredited) |