Der Kommissar is a German television series about a group of detectives of the Munich homicide squad (Mordkommission). All 97 episodes, which were shot in black-and-white and first broadcast between 1969 and 1976, were written by Herbert Reinecker and starred Erik Ode as Kommissar Herbert Keller. Keller's assistants were Walter Grabert, Robert Heines, and Harry Klein who, in 1974, was replaced by his younger brother Erwin Klein.

Fritz Wepper was a German film and television actor. He is best known for his role as Inspector Harry Klein in the long-running crime series Derrick (1974–1998). Wepper is also remembered for his roles in the films Cabaret (1972) and The Bridge (1959) and as Mayor Wöller in the TV series Um Himmels Willen (2002–2021).