The Uncanny X-Men
Forge must use the X-Men's life force to banish the Adversary from Earth, causing the team's deaths. Roma brings them back to life.
X-Men sacrifice themselves on live television; resurrected by Roma in secret
Collects X-Factor #24-26, The New Mutants #59-61, The Uncanny X-Men #225-227. The landmark 1988 crossover across all three X-books — sacrifice, transformation, and loss.
Collects X-Factor #18-26, The Uncanny X-Men #220-227 and The New Mutants #55-61. The complete Fall of the Mutants - Apocalypse, the X-Men sacrifice in Dallas, and the Ani-Mator.
Collects X-Factor #24-26 and material from 3 other series. The three-front crossover that changed the X-Men, X-Factor, and New Mutants.
Collects X-Factor #18-26, Uncanny X-Men #220-227, and New Mutants #55-61. The Fall of the Mutants -- three X-teams face separate crises that change them forever.
Collects The Uncanny X-Men #220-227, The New Mutants #55-61. The 1988 crossover where Storms team sacrifices themselves on live TV and the New Mutants battle the Ani-Mator.