Leo is put in charge of building a maze at Fixham Castle while Bob and Wendy work elsewhere. Scoop encourages Leo to make the maze more difficult, and when the vehicles test it, they all get lost. Leo uses a drone to guide the wayward vehicles out./ Bob is made Grand Marshall of the big parade, and decides that whichever vehicle makes the best build can carry him in it. They soon learn that they need each other to succeed, and work together to make a super float for carrying Bob. Air Date: Jan 2, 2018