How many movies have Harry Shearer and Mark Kirkland collaborated on?

They have worked on 1 movie together! Their first movie together was The Simpsons: Treehouse of Horror (2003) and was their highest rated movie together. They have not worked together since The Simpsons: Treehouse of Horror (2003).

Role
Mr. Burns / Smithers / Ned Flanders / Kang / Skinner (voice)
Crew
Director