Uncanny X-Men 200

Magneto becomes headmaster of Xavier’s Academy, 1st team app. Fenris

Uncanny X-Men 203

Newsstand

Phoenix is ready to stand against the Beyonder, and with Shadowcat. Secret Wars II

Uncanny X-Men 204

Newsstand

Nightcrawler

Uncanny X-Men 205

Origin of Lady Deathstrike

Uncanny X-Men 208

1st mention of the term "Omega Class Mutant"

Uncanny X-Men 209

Men and Hellfire Club are forced to work together in order to defeat the threat of Nimrod.

Uncanny X-Men 210

1st cameo team app. The Marauders

Uncanny X-Men 211

1st full team app. The Marauders, Marvel 25th Anniversary Frame Cover

Wolverine Marvel 25th Anniversary Cover

Uncanny X-Men 214

Dazzler joins the X-Men

Uncanny X-Men 215

1st appearance Crimson Commando, first appearance of Stonewall, 1st app. Super Sabre