How many movies have Max Mittelman and Sam Register collaborated on?

They have worked on 4 movies together! Their first movie together was DC Super Hero Girls: Legends of Atlantis (2018) while their highest rated movie together was Reign of the Supermen (2019). They have not worked together since Teen Titans Go! & DC Super Hero Girls: Mayhem in the Multiverse (2022). They are most known for their animation films together.