A new teacher, Dr. Dr. Bach, is transferred from his quiet village elementary school to the Mommsen Gymnasium, bringing along his nephew Jan. Bach's lackadaisical methods raise the suspicions of the other teachers.

Hansi Kraus
as Pepe Nietnagel

Peter Alexander
as Dr. Peter Bach

Heintje Simons
as Jan

Theo Lingen
as Oberstudiendirektor Dr. Gottlieb Taft

Gerlinde Locker
as Julia Schumann

Werner Finck
as Ministerialdirektor von Schnorr

Rudolf Schündler
as Studienrat Dr. Arthur Knörz

Ruth Stephan
as Studienrätin Dr. Mathilde Knörz

Hans Terofal
as Pedell Georg Bloch

Carola Höhn
as Frau Nietnagel