The X-Men, the MRD, and S.H.I.E.L.D. fight against Magneto’s Sentinels. Meanwhile, the Hellfire Club successfully unleashes the Phoenix, which possesses the Stepford Cuckoos and is instructed to destroy the Sentinels, the X-Men and Genosha. Cyclops, Jean and Emma fight the Phoenix. During the battle, Emma seemingly sacrifices herself and destroys the Phoenix. From the future, Professor X informs the X-Men that they accomplished their mission and avoided the bleak, sentinel-run world. However, there is a new future that has taken its place: the Age of Apocalypse.