New neighbor Frankie Fritz bot-naps Botasaur, making Rusty and Ruby go on a chase to get their friend back. Rusty builds a machine that makes and stacks sand blocks, to help Liam build a giant sand castle. But when Bytes bumps into it and causes it to fritz, it runs off and starts making sand structures all over town, trapping people, blocking train tracks, and creating a giant sand castle pyramid in the middle of town.