Earth's Mightiest Heroes battle the Children of the Atom in a crossover so huge it calls for Marvel's biggest ever Omnibus! Get the whole story of the Phoenix Force's return to Earth, an event that kicks off an all-out war between the Avengers and the X-Men! The X-Men see the Phoenix as mutantkind's salvation, and the Avengers consider it a deadly danger. But what happens when five of the X-Men are transformed by the Phoenix...and begin to change...
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