How many movies have Elroy Schwartz and Sherwood Schwartz collaborated on?

They have worked on 4 movies together! Their first movie together was The Wackiest Wagon Train in the West (1976) while their highest rated movie together was The Castaways on Gilligan's Island (1979). They have not worked together since The Harlem Globetrotters on Gilligan's Island (1981). They are most known for their comedy films together.