When most people think of the X-Men, they think of the X-Men from the Mutant Genesis era. As part of the 1991 relaunch, longtime writer Chris Claremont combined both old and new X-Men teams together for the first time to face off against a rejuvenated Magneto. Paired with Jim Lee’s spectacular art, issue #1 would become the single best selling comic book of all-time; a record that it holds to this day. It also doesn’t hurt that most of the classic X-Men cartoon is based on this specific era of the team.
The X-Men: Mutant Genesis trade paperback contains the first seven issues from the aforementioned relaunch. Magneto is the focus of the first three issues, as he and a group of fanatical mutants threaten the Earth from his personal asteroid in outer space. Following that is the explosive debut of Omega Red.