How many movies have Gert Verhulst and Katleen Vander Velde collaborated on?

They have worked on 3 movies together! Their first movie together was Plop and the Magic Wand (2003) while their highest rated movie together was Plop and Kwispel (2004). They have not worked together since Piet Piraat en de Betoverde Kroon (2005). They are most known for their family films together.