Mary's new in town. She's worried about starting classes at her new school. That's why her mom calls the Helper Hounds-and why Sparkplug, the wildly handsome, wickedly smart, card-carrying, world-famous Helper Hound is on the scene. Sparky knows a thing or two about moving. He moved four times as a puppy, and learned to make new friends along the way. Sparky knows he can teach Mary all his best tricks and help her meet new friends, too. At least Sparky...