Published Oct 1979 by Marvel.
Mark Jeweler Advertisement Insert Variant. "How Sharper Than a Serpent's Tooth!" Script by Chris Claremont, pencils by John Byrne, inks by Terry Austin. In this issue, the X-Men reach Muir Island and discover the threat of Mutant X has temporarily passed because he has fled the research compound. After learning that Mutant X is Moira's son, the X-Men search him. Meanwhile, Mastermind continues to erode Jean's sanity. Nightcrawler, Wolverine, and Storm are the first to confront Mutant X, who calls himself Proteus, and are unfortunately subjected to his reality altering powers. Havok appearance. Dave Cockrum/Austin cover. Cover price $0.40.