Festive children's animation featuring the voice of Mariah Carey. All young Mariah (Breanna Yde/Carey) has ever wanted for Christmas is a puppy, but so far Santa has failed to grant her wish. However, when her uncle Reggie goes out of town, Mariah's dad agrees she can look after his dog while he's away and, if it goes well, she may just get what she's always wanted for Christmas after all.