How many movies have Ralph Herforth and Thierry van Werveke acted in together?

They have worked on 4 movies together! Their first movie together was Der Venusmörder (1996) while their highest rated movie together was Knockin' on Heaven's Door (1997). They have not worked together since 1½ Ritter - Auf der Suche nach der hinreißenden Herzelinde (2008).