How many movies have Alan Burnett and Liza-Ann Warren collaborated on?

They have worked on 4 movies together! Their first movie together was DuckTales: The Movie - Treasure of the Lost Lamp (1990) while their highest rated movie together was Batman Beyond: Tech Wars / Disappearing Inque (1999). They have not worked together since Batman Beyond: Tech Wars / Disappearing Inque (1999). They are most known for their animation films together.