Ultimate Galactus, Vol. 3: Ultimate Extinction

Collects Ultimate Exinction #1-5. It's time for the coming of Gah Lak Tus! And his arrival could mean the end of all life on this planet! Not even the power of S.H.I.E.L.D or the brilliance of Fantastic Four leader Reed Richards seems able to stop its inexorable march to Earth. What role do the Ultimate X-Men have in this drama?