Looking at the sky one frosty night, Marty sees the Dog Star in all its brilliance for the first time. Although she has Tiggy, her cat, Marty longs for a dog; she'd call it Star. Later that night, when the Dog Star's light beams into her room, she discovers a real live dog beneath her bed and it seems that her wish has come true. But will Star bring Marty and her family happiness?