A little possum's ill-fated wish for a white Wishmas not only freezes her entire community of Sanctuary City, but also poses a threat to the lives of everyone who lives there. Before the magical Wishmas Tree perishes, she must embark on a treacherous trek into the WILD, battling self-doubt, phantom predators, and eventually, Extinction itself, in order to undo the damage she has made and save her city.