Due to a plot by the teaching staff, headmaster Taft is forced into early retirement and Knörz is appointed headmaster. However, they didn't count on class 13a, and especially not on their spokesperson Pepe Nietnagel. They are anything but happy about losing Taft, their favorite enemy. Without further ado, Pepe and his friends join forces with Taft and hatch a series of daring pranks to get back at Knörz.
| Actor | Role |
|---|---|
 Hansi KrausPepe Nietnagel | Pepe Nietnagel |
 Theo LingenOberstudiendirektor Dr. Gottlieb Taft | Oberstudiendirektor Dr. Gottlieb Taft |
 Renate RolandDenise Moreaux | Denise Moreaux |
 Evelyn OpelaHelena Kersten, geb. Taft | Helena Kersten, geb. Taft |
 Ilja RichterTaft als Junge | Taft als Junge |
 Hans KorteProfessor Heinzerling | Professor Heinzerling |
 Rudolf SchündlerOberstudienrat Dr. Arthur Knörz | Oberstudienrat Dr. Arthur Knörz |
 Hans TerofalPedell Georg Bloch | Pedell Georg Bloch |
 Balduin BaasOberstudienrat Blaumeier | Oberstudienrat Blaumeier |
 Ernst StankovskiDr. Kersten | Dr. Kersten |
 Ernst H. HilbichDr. Heidemann | Dr. Heidemann |
| CCharlotte WitthauerFrau Taft | Frau Taft |
 Monika DahlbergFrl. Weidt | Frl. Weidt |
| AAnita MallyLydia | Lydia |
| LLilo SchickFrau Blaumeise | Frau Blaumeise |
 Bruno W. PantelMüller | Müller |
| HHorst PasderskiPolizist | Polizist |
 Josef MoosholzerLehrer | Lehrer |
 Erich FiedlerOber | Ober |