How many movies have R.L. Stine and William Fruet collaborated on?

They have worked on 4 movies together! Their first movie together was Goosebumps: Attack of the Mutant (1996) while their highest rated movie together was Goosebumps: Chillogy (1998). They have not worked together since Goosebumps: Chillogy (1998). They are most known for their horror films together.