How many movies have Marilyn Graf and Phyllis Ginter collaborated on?

They have worked on 3 movies together! Their first movie together was Thirteen (2003) while their highest rated movie together was Scooby-Doo! and the Loch Ness Monster (2004). They have not worked together since Scooby-Doo! and the Loch Ness Monster (2004). They are most known for their comedy films together.