See, here's what I don't get about fighting game Mortal Kombat: who cares how Sub-Zero became Sub-Zero? This is a fighting game. He's there for the punching, and the kicking, and the killing, and that's it.
Still, so long as there are Mortal Kombat fans out there who do care, Warner Bros. will keep releasing these story clips. Ah well, for everyone else, in between all the stuff about revenge and brothers there's plenty of footage of Sub-Zero freezing people then stabbing them then - around 50 seconds in - going strangely 2D, like a Mortal Kombat version of Venture Bros.