How many movies have Bonnie Buckner and Howard Schwartz collaborated on?

They have worked on 3 movies together! Their first movie together was Batman Beyond: Tech Wars / Disappearing Inque (1999) while their highest rated movie together was Scooby-Doo! and the Sea Monsters (2012). They have not worked together since Scooby-Doo! and the Sea Monsters (2012). They are most known for their animation films together.