Helper Cars Season 1 Episode 47 Big Magnet

A puppy finds a bolt next to its booth and begins to play with it. Suddenly, the bolt goes missing somewhere. It is magnetized to a large magnet, which is taken away by a truck crane for kids. The puppy runs for the truck crane for kids to return the bolt, and ends up at a construction site where Helper cars are demolishing an old building. Together with the rubble of the old house, the bolt gets into a dump truck for kids, which takes it to a landfill. The puppy has to go a long way to return the bolt. But the dog still does not know what it is for.