How many movies have Frank Welker and Sven Libaek collaborated on?

They have worked on 3 movies together! Their first movie together was Yogi Bear and the Magical Flight of the Spruce Goose (1987) while their highest rated movie together was Scooby-Doo and the Ghoul School (1988). They have not worked together since Scooby-Doo! and the Reluctant Werewolf (1988). They are most known for their tv movie films together.