The end is here! Or, is it a new beginning? Massive, climatic disturbances are wreaking havoc with the planet - underwater volcanic eruptions, tidal waves crashing over whole cities, and snowstorms burying entire countries - and even the assemblage of the Ultimate U's mightiest is no match for this worldwide destruction! Featuring Spider-Man, the Fantastic Four, the X-Men, the Ultimates, the Hulk, and more, find out whose lives are at stake in this defining moment of truth for the Ultimate Universe. Brought to you by award-winning scribe Jeph Loeb and superstar artist David Finch, this is the must-have book that will set the stage in the "Ultimate U" for years to come! This title collects "Ultimatum" numbered 1-5.