How many movies have Collette Sunderman and Sam Register collaborated on?

They have worked on 9 movies together! Their first movie together was Scooby-Doo! Stage Fright (2013) while their highest rated movie together was Scooby-Doo! Shaggy's Showdown (2017). They have not worked together since Scooby-Doo! The Sword and the Scoob (2021). They are most known for their animation films together.