How many movies have Jerry Siegel and William Moulton Marston collaborated on?

They have worked on 19 movies together! Their first movie together was Justice League: Gods and Monsters (2015) while their highest rated movie together was Justice League Dark: Apokolips War (2020). They have not worked together since Justice League: Crisis on Infinite Earths Part Three (2024). They are most known for their action films together.