How many movies have Garry Chalk and Walter P. Martishius collaborated on?

They have worked on 8 movies together! Their first movie together was Barbie of Swan Lake (2003) while their highest rated movie together was Barbie in the 12 Dancing Princesses (2006). They have not worked together since Barbie in A Mermaid Tale 2 (2012). They are most known for their family films together.