How many movies have Johan Vlemmix and Martijn van Nellestijn collaborated on?

They have worked on 4 movies together! Their first movie together was Sinterklaas en het Gevaar in de Vallei (2003) while their highest rated movie together was Sinterklaas en het Uur van de Waarheid (2006). They have not worked together since Sinterklaas en het raadsel van 5 december (2011).