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The Revised & Expanded X-Men Reading Order Guide – Era #2: Second Genesis
Now that I’ve re-read all of the X-Men Classic back-up stories and Marvel Team-Up issues as part of our Epic X-Men (re)Read, I had some adjustments to make to this guide. I also rebuilt my reading order database, which allowed me to catch some stray appearances mentioned in the comments of the page.
I think the most-significant change to this reading order is that I’ve promoted a handful of Iron Fist and Marvel Team-Up issues to be required reading from being optional, since they were written by Claremont and fill in actions and relationships referred to later in the main Uncanny run.

That’s not the only reason 2019 was a historic year for the X-Men. As a film media property, the rights to X-Men returned to the Marvel fold when Disney acquired FOX in March of 2019.