How many movies have Kai Hansen and Sascha Gerstner acted in together?

They have worked on 5 movies together! Their first movie together was Helloween ft. Kai Hansen: Rock in Rio 2013 (2013) while their highest rated movie together was Helloween: Pumpkins United: Live At Wacken 2018 (2018). They have not worked together since Helloween: United Alive in Madrid (2019).