Once Upon a Zerby / Follow the Dotty Line / Wheely, Wheely B

A rainy day in Zerby Town has Zack, Lily and Axle telling a story about dragons and knights. But when Rex joins, it takes him a while to learn that making up a story with others also means listening. --- Zack and Rex are taking some fresh batteries out to some Zerbies who ran out of power. Dotty the drone knows the way. But following a flying Zerby isn't easy. --- Axle can't go off road as easily as Zack because his wheels are so small, so he gets bigger wheels - even bigger than Zack's. Then Zack gets bigger wheels. Then Axle gets even bigger wheels...