"It's the night before Christmas but Andy and Terry aren't ready yet! They haven't written their letters to Santa, sung any carols, or hung their stockings. When Santa Claus's sleigh crash-lands in the treehouse, the reindeer become tangled in the branches and Santa falls into the cloning machine. With dozens of Santas running around and no way to tell which one's the real one, who's going to deliver all the presents? It's up to Andy, Terry, and Jill...

Sarah (Tatiana Maslany) is an outsider, orphan, and street-wise chameleon who discovers she's one of a series of clones (all played by Maslany). Not knowing who created them or why, the identical "sestras" forge deep bonds with each other. As the family unravels the conspiracy behind the clone experiment, the sisters place themselves at great risk to attain freedom for themselves, their families, and the host of clones they have yet to meet.