How many movies have Kathi Castillo and Sander Schwartz collaborated on?

They have worked on 4 movies together! Their first movie together was Scooby-Doo! and the Loch Ness Monster (2004) while their highest rated movie together was Chill Out, Scooby-Doo! (2007). They have not worked together since Chill Out, Scooby-Doo! (2007). They are most known for their mystery films together.