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In Billy & Mandy Save Christmas, she does not believe in Santa Claus until she, along with Billy and Grim, travel to the North Pole, where they learn that Santa was bitten by a vampire. In an attempt to get Santa to revert back to normal, Mandy sings "Up on the Housetop".
|This article about a character from either a Christmas movie, television episodic series or special with a Christmas theme is a stub. Please help to expand this article in the Christmas Specials Wikia.|