X-Men Vol. 2 #115

Cassandra Nova and Donald Trask III plot the impending doom of mutantkind. On Professor Xavier’s orders, Cyclops and Wolverine try to stop them while escorting Ugly John. During their mission, the inbound X-Men are attacked and captured by a squadron of wild sentinels protecting Ms. Nova and Mr. Trask. Beast is alerted and tells Professor Xavier, who is resting after Ms. Nova’s telepathic assault last issue.

Ms. Nova betrays Mr. Trask and kills him, taking control of the wild sentinels and ordering them to destroy Cyclops, Wolverine, Ugly John, and mutants worldwide. Cyclops and Wolverine apprehend Ms. Nova, but not before Ugly John is killed. An arsenal of sentinels wreaks havoc in Genosha, killing millions while Xavier, Jean, and Beast watch in horror.

Last Comics Code Authority approved issue.