How many movies have Joe Ruby and Ken Spears collaborated on?

They have worked on 21 movies together! Their first movie together was Scruffy (1980) while their highest rated movie together was Scooby-Doo's Creepiest Capers (2000). They have not worked together since Scooby-Doo! and Krypto, Too! (2023). They are most known for their comedy films together.