I had a brain fart, I saw this a little while ago and didn't even think to post it here. But yeah, it might not be to everyone's taste (certainly not the victim's) for obvious reasons. Even by Mortal Kombat standards, it's pretty gruesome.
Image and WebM here. Note, as OP said, MAJOR PLOT SPOILERS. This isn't a move or Fatality, it's a cutscene in the story mode.