X-Factor: The Original X-Men Omnibus Vol. 1

The return of Jean Grey sparks the reunion of the original X-Men as X-Factor, who masquerade as a mutant-hunting group. Their mission becomes perilous with the emergence of the villain Apocalypse and the chaos of the Mutant Massacre. As they strive to rescue young mutants, the team faces internal betrayal and personal tragedies, including Angel's life-altering injury and Cyclops' descent into madness. The story intertwines various Marvel titles, showcasing intense battles and transformative character arcs amidst a backdrop of danger and loyalty.