The Mud and Slime Mysteries is Joel Stewart and Steve Roberts' first book collaboration. Previously to this they have collaborated on TV animation including Abney & Teal and BOT an...ver maisThe Mud and Slime Mysteries is Joel Stewart and Steve Roberts' first book collaboration. Previously to this they have collaborated on TV animation including Abney & Teal and BOT and the Beasties. Steve created DipDap and Twirlywoos for Ragdoll, which both won Children's BAFTAs. Before his work in television Steve was a freelance illustrator in comics.ver menos