Collects Ultimate X-Men #98-100, Ultimate Fantastic Four #58-60. The end is near! Eastern Europe is frozen solid in the grip of a sudden ice age. A tidal wave of biblical proportions mercilessly sweeps through New York City. Millions have been killed, and countless more injured or displaced - among them members of the X-Men and Fantastic Four. And Magneto is to blame. In the wake of this unimaginable catastrophe, is it a time to repent? Or is it a time for revenge? See Ultimatum through the eyes of two of the world's greatest teams - or what's left of them, at least!.