How many movies have Helge Billing and Jan Grønli collaborated on?

They have worked on 4 movies together! Their first movie together was The Junior Olsen Gang Goes Submarine (2003) while their highest rated movie together was The Junior Olsen Gang at the Circus (2006). They have not worked together since The Junior Olsen Gang and the Master Thief (2010). They are most known for their family films together.