How many movies have Bill Lutz and William Hanna collaborated on?

They have worked on 2 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).