Or, as the author puts it, "Santa, When the Claws Fell."
John C. Worley is as reliable as the holodeck's safety protocols failing and doors sealing in any given episode. Every Christmas, he produces a new carol in which he splices together scenes from Star Trek in such a way that the cast is singing a classic carol. This year, it's "Santa Claus Is Coming to Town." Worley cleverly uses phrases from the Tamarian language to fill in gaps in the lyrics.
His past works include: