For years, the tiny island nation of Genosha has enslaved its mutant population while the rest of the world has turned a blind eye. Now, as the situation turns bleak, Professor Charles Xavior is stunned to find the true force lurking behind the Genoshan government. With the fate of all mutantkind hanging in the balance, Professor Xavior must unleash the X-Men to face the most powerful mutant of them all- The Mighty Apocalypse!