X-men : Alpha - Published 1995, this was the book to start the series. The first glimpse into the world where Apocalypse reigns. Each X-title book after this became a different book to coincide with the storyline.
X-Calibre - A team lead by Nightcrawler consisting of his mother, Mystique, Switchback, and later a villain, Damask who joins after realizing which side is better. (replaced Excalibur)
Gambit and the Externals - Gambit leads this team consisting of Jubilee, Sunspot, Strong guy, and Lila Cheney. (replaced X-Force)
Generation Next - Colossus, and Kitty Pryde lead this team of New Mutant- like youngsters. This team features Chamber, Husk, Mondo, Skin, and Vincent Cimetta. They go on a rescue mission to find Magik. (replaced Generation X)
Astonishing X-men - This team is lead by Magneto's wife, Rogue. Sabretooth, Blink, Wild Child, Morph, and Sunfire make up this team. (replaced Uncanny X-men)
Amazing X-men - Quicksilver leads this team made up of Storm, Dazzler, Iceman, Banshee, and Exodus. (replaced X-men)
Weapon X - Wolverine gets the girl in this alternate reality. Jean Grey, and Logan are together in this book. Logan tries to recruit Gateway to help save N. America. (replaced Wolverine)
Factor X - Are enemy teams created by Apocalypse. Consisting of Cyclops, Havok, Emplate, Twins, Canonball, Amazon, the Bedlam Brothers, Aurora, Northstar, and Beast who conducts experiments on imprisoned mutants. (replaced X-Factor)
X-man - The mutant Nate Grey, is created from Jean Grey, and Cyclops. He is mentored by Forge, who leads a group consisting of Mastermind, Toad, Brute, Sauron, and late Sonique. (replaced Cable)
X-Universe - Colossus's Brother Mikhail is opposed by a familiar group of humans, who are Tony Stark, Gwen Stacy, Don Blake, Sue Storm, Ben Grimm, Victor Von Doom, and later Bruce Banner. (replaced X-men Unlimited)
X-men: Omega - The finale of the Age of Apocalypse saga.