How many movies have Indira Stefanianna and William Hanna collaborated on?

They have worked on 3 movies together! Their first movie together was Scooby-Doo's Creepiest Capers (2000) while their highest rated movie together was Scooby-Doo's Spookiest Tales (2003). They have not worked together since Scooby-Doo's Spookiest Tales (2003). They are most known for their family films together.