How many movies have Heather North and William Hanna collaborated on?

They have worked on 5 movies together! Their first movie together was Scooby Goes Hollywood (1979) 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 animation films together.