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.

Pepe Nietnagel
Oberstudiendirektor Dr. Gottlieb Taft
Denise Moreaux
Helena Kersten, geb. Taft
Taft als Junge
Professor Heinzerling
Oberstudienrat Dr. Arthur Knörz
Pedell Georg Bloch
Oberstudienrat Blaumeier
Dr. Kersten
Dr. Heidemann
Frau Taft