Peter Alexander as Dr. Peter Markus

Christiane Hörbiger as Ursula Kannenberg

Theo Lingen as Herr Kannenberg

Marietta Meade as Gaby

Martin Held as Professor Hebbel

Regina Claus as Corinna Kannenberg

Hans Quest as Oberschulrat

Blandine Ebinger as Fräulein Kröselmeier

Balduin Baas as Brummer

Max Grießer as Obermeier

Bruno W. Pantel as Ballenbusch