How many movies have Arnold Petersheim and Veslemøy Fosse Ree collaborated on?

They have worked on 4 movies together! Their first movie together was The Olsen Gang and Dynamite-Harry On The Trail (1977) while their highest rated movie together was The Olsen Gang Never Gives Up! (1981). They have not worked together since But The Olsen Gang Was Not Dead! (1984). They are most known for their crime films together.