Based on Mariah Carey's hit holiday tune and illustrated book, this charming animated tale follows young Mariah (voiced by Breanna Yde), who wants nothing more for Christmas than the puppy she saw in the pet store. In order to prove she can be responsible, she must take care of her uncle's dog, Jack, a scruffy, misbehaving pooch who shakes up Mariah's holidays in ways she never expected. Also features the voices of Henry Winkler, Phil Morris, and Carey as the older Mariah.