In the face of two world wars, Professor Prätorius, a philanthropist and a surgeon, wants to exterminate the one danger to mankind, the microbe of stupidity, as he states in a spontaneous lecture to his male and female students. When he tries to help a pregnant girl he gets involved more and more in her life and is forced to marry her. The melodramatic comedy was the first film by Curt Goetz after his return from America and a top hit in post-war German cinema. The DVD presents the restored original version as well as a radio play by Curt Goetz from 1947 and an interview with Valerie von Martens, his wife who performed with him in all his films and radio plays.