Newsstand Edition.

"How Sharper than a Serpent's Tooth...!" Part 1 of 3. Story by Chris Claremont and John Byrne. Art by John Byrne and Terry Austin. Cover by Dave Cockrum and Terry Austin. The X-Men return to Muir Island to investigate the attack on Polaris and Havok. When they get there, they find themselves in a deadly battle against arguably the most powerful and deadliest mutant alive - Mutant X! 1st appearance of Proteus. 36 pgs. Cover price $0.40.