My group played this as "Santa Claus is Dead," some cosmic horror got mixed in there somehow, and the result was probably the funniest one-shot I've ever been in. Highly recommended.
I was in this game!
Krampus ate all the cookies.
The robot running the toy factory got overthrown by an Luddite elf rebellion.
The friendly worker elf impersonating Saint Nick was assassinated (by a penguin?).
The eldritch entity known as Rudolph escaped from his cyclopean cryo-tomb.
Comet's understudy took over Christmas and rebranded it to be entirely reindeer themed.
10/10 would kill Santa again.