Uncanny X-Men(vol.1) #108

"Armageddon Now!" Part 3 of 3. Guest-starring the Starjammers. Cameos by the Avengers, Fantastic Four, and Firelord. Story by Chris Claremont. Art by John Byrne and Terry Austin. On the far side of the universe alone and cut off from their mentor, the X-Men must face their worst nightmares if they are going stop the mad Emperor D'Ken, from unleashing the unimaginable power of the M'Krann Crystal upon the universe.