How many movies have Gerhard Heinz and Otto Retzer collaborated on?

They have worked on 27 movies together! Their first movie together was Cry of the Black Wolves (1972) while their highest rated movie together was Superbug, the Craziest Car in the World (1975). They have not worked together since Die Schokoladenschnüffler (1986). They are most known for their comedy films together.