How many movies have Frank Welker and Gigi Meroni collaborated on?

They have worked on 2 movies together! Their first movie together was Scooby-Doo! and the Legend of the Vampire (2003) while their highest rated movie together was Scooby-Doo! and the Monster of Mexico (2003). They have not worked together since Scooby-Doo! and the Monster of Mexico (2003).