While riding their scooters at the park, the bickering kids meet the Smiths. A brother and sister who don't seem to argue like our gang does - in fact, the two Smiths are super-supportive of each other! When they start pushing the other kids around, Boy, Girl, Dog, Cat, Mouse and Cheese challenge the Smiths to a race around the park! But our heroes have one problem - Cat doesn't know how to ride a scooter! The kids take turns teaching her and, when race day comes, Cat will really need to kick it into high gear if she wants to help the family beat those smug Smiths!

With Boy's new help-for-hire business booming, he overworks his unpaid employee, Dog, without realizing. Dog is too loyal to say no, but he's miserable, especially when his next job is walking some mean cats. Girl sets out to teach Dog a lesson about standing up for himself, pretending to lose the cats to make Dog realize he should have said no to Boy, which will teach him to do just that in the future! But when the cats really go missing, they frantically set out to find them before Boy's business is ruined!