How many movies have Glen Murakami and Haven Alexander collaborated on?

They have worked on 3 movies together! Their first movie together was Batman: Mask of the Phantasm (1993) 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.