How many movies have Cosmo Anzilotti and William Hanna collaborated on?

They have worked on 3 movies together! Their first movie together was The Flintstones: Hollyrock a Bye Baby (1993) while their highest rated movie together was Scooby-Doo on Zombie Island (1998). They have not worked together since Scooby-Doo! and the Witch's Ghost (1999). They are most known for their family films together.