How many movies have Corey Hartzog and Koji Kasamatsu collaborated on?

They have worked on 2 movies together! Their first movie together was Starship Troopers: Invasion (2012) while their highest rated movie together was Starship Troopers: Traitor of Mars (2017). They have not worked together since Starship Troopers: Traitor of Mars (2017).