X-Tinction Agenda
1990The island nation of Genosha kidnaps members of the X-Men and New Mutants to enslave them using the mutate bonding process. The combined forces of the X-Men, X-Factor, and New Mutants launch a rescue mission that topples the Genoshan government. Cameron Hodge, now a monstrous cyborg, serves as the primary antagonist, and Havok is brainwashed into serving Genosha as a magistrate.
9 core issues, 0 optional tie-ins/crossovers
The Uncanny X-Men #270
Genoshan Magistrates abduct Storm and New Mutants members
The New Mutants #95
X-Factor #60
The Uncanny X-Men #271
Rescue teams head to Genosha; Havok revealed as brainwashed magistrate
The New Mutants #96
X-Factor #61
The Uncanny X-Men #272
Final assault on the Genoshan Citadel
The New Mutants #97
Death of Warlock; defeat of Cameron Hodge
X-Factor #62
Genoshan regime collapses; aftermath