Collects Amazing X-Men #7-12.

A tragic death at the Xavier Institute reveals a powerful enemy living among the X-Men that they could never have suspected - and no, it's not Magneto. Things heat up in a way none of the X-Men ever dreamed, but will teamwork save the day when they can't even depend on themselves? Collects Astonishing X-Men (2004) #7-12

What happens when you combine an industry veteran at the top of his game with a hot, up-and-coming young artist, and let them loose on Marvel's mightiest mutants? You get a fan-favorite, multi-year X-Men run unequaled in style, pizzazz and wall-to-wall action! It's Chris Claremont's most ambitious story arc ever, featuring Jim Lee's dynamic debut issues and major changes to the X-Men's status quo! Jubilee debuts just as the X-Men disband, granted new lives by the Siege Perilous! The Reavers enact gruesome revenge on Wolverine and decimate Muir Island, while Psylocke is transformed into a ninja! The Shadow King makes his play for Storm, culminating in the action-packed introduction of Gambit! Wolverine's hidden past with Captain America and the Black Widow is revealed! And this is just the first volume! Collecting UNCANNY X-MEN #244-269, X-MEN ANNUAL (1970) #13 and CLASSIC X-MEN #39.

Chris Claremont, Dave Cockrum and John Byrne took a little reprint series called X-MEN and turned it into the all-new, all-different titan that conquered comicdom. Now, you can experience the thrills and excitement of their classic tales from "The Dark Phoenix Saga" to "Days of Future Past" -- and so much more -- in this enormous Omnibus! Including the debuts of X-universe mainstays Emma Frost and Kitty Pryde, the threat of Mystique's Brotherhood of Evil Mutants, Magneto's return, Wolverine's first solo story, and a rare Savage Land adventure -- plus the original ending of "Dark Phoenix" and a host of bonus stories! Collecting X-MEN (1963) #132-141 and ANNUAL (1970) #4-5, UNCANNY X-MEN (1981) #142-153, AVENGERS ANNUAL (1967) #10, MARVEL FANFARE (1982) #1-4, MARVEL TREASURY EDITION #26-27, MARVEL TEAM-UP (1972) #100, BIZARRE ADVENTURES (1981) #27, and PHOENIX: THE UNTOLD STORY

The chart-topping super-team of Joss Whedon (TV's Buffy The Vampire Slayer, Runaways) and John Cassaday (Planetary, Captain America) return for more Astonishing X-Men! If you thought their past efforts were full of shocks and surprises, hold onto your eyeballs because you haven't seen anything yet! Things go from peculiar to just plain bizarre as Emma Frost's erratic behavior sends the X-Men spinning in a nonstop downward spiral. Will an unlikely union be the final straw? After secretly lying in wait for months, the new Hellfire Club makes its move! Plus: The X-Man destined to destroy the Breakworld stands revealed! Who is it, and what will be their fate? And will the X-Men be able to protect Earth from certain destruction at the hands of the Breakworld? When it's all over, nothing will ever be the same! No, really, we mean it!

Collects Amazing X-Men (2013) #1-6. Ever since Nightcrawler's death, the X-Men have been without their heart and soul. But after learning that their friend may not be gone after all, it's up to Wolverine, Storm, Beast, Iceman, Northstar and Firestar to find and bring back the fan-favorite fuzzy blue elf! But when the team finds themselves separated and split between heaven and hell, can they get to Nightcrawler's soul before his father, the evil Azazel, does? Pushed over the edge, the Beast gives into his savage side like never before, as Nightcrawler rallies the X-Men to take on Azazel and his hellish hordes! Can the X-Men save the afterlife, or must one of the team make the ultimate sacrifice?

When the Gem of Cyttorak reappears, seeking to create a new avatar, none hear its call more than those who have previously housed the power of the unstoppable Juggernaut: Cain Marko and Colossus! But they aren’t the only ones hunting for the Gem. Can the X-Men find it before it’s too late? And can Colossus resist the temptation of Cyttorak’s power? “Unstoppable” takes on a whole new meaning as Cyttorak’s gem is finally located. The Juggernaut rises, and the X-Men fall! Has the Juggernaut returned? Is this the last stand of Colossus? Plus: A death in Storm’s family sends the X-Men to Africa! And as AXIS inverts the X-Men, Anole’s deepest fears are unleashed on the streets of New York City, and Nightcrawler and Mystique’s relationship reaches a boiling point! Collecting AMAZING X-MEN (2013) #13-19 and Annual #1.