Ultimate X-Men Vol. 4: Hellfire & Brimstone

Just as existence for the X-Men settles back to "normal," Jean Grey's life shifts to the bizarre as she experiences strange visions -- of a giant flaming bird! To save the world, will the X-Men strike down their own teammate?

The Hellfire Club extends an invitation for the X-Men to join them. Little do the heroes know that a dark plan has been in the works for years and is about to come to fruition!

Collecting: Ultimate X-Men (2000) #21-25.