Collects X-Men (1963) #141, Uncanny X-Men (1981) #142, X-Men Annual (1970) #14, Excalibur (1988) #52, #66-67, Wolverine: Days of Future Past #1-3, and material from Fantastic Four Annual #23, New Mutants Annual #6, X-Factor Annual #5, and Hulk: Broken Worlds #2.