Madrox, Strong guy, Quicksilver and the rest face crises of diplomacy, deception and death while protecting humans from mutants and vice versa.

With Mutant Town under siege and the X-Cell having taken refuge there, X-Factor races both the clock and their own divided allegiances as they try to stave off the very real possibility of every former mutant being rounded up and imprisoned as a potential terrorist. But will they have to reveal their knowledge of M-Day's secret... and, if so, what will the fallout be? Collects X-Factor #18-24.

The members of X-Factor - - Cyclops, Jean Grey, Iceman, Beast, and Archangel -- are professionals through and through. But when the likes of Sabretooth, a cadre of vampires, and a threat from an alternate dystopian future wage war against our heroes, it's no big surprise that things tend to get a little out of control even for them! COLLECTING: X-FACTOR (1986) 51-59, ANNUAL 4-5; X-FACTOR: PRISONER OF LOVE; MARVEL FANFARE (1982) 50; MATERIAL FROM FANTASTIC FOUR ANNUAL 23, NEW MUTANTS ANNUAL 6, X-MEN ANNU&AL (1970) 14

Peter David's first, transformative X-FACTOR run in one volume! Havok, Polaris, Quicksilver, Multiple Man, Wolfsbane and Strong Guy are the all-new, all-different X-Factor! Sanctioned by the U.S. government to protect humans from mutants -- and vice versa -- they take on threats including Mister Sinister and his Nasty Boys, the Mutant Liberation Front and...the Incredible Hulk?! But their most challenging encounter is on the couch of super hero psychiatrist, Doc Samson! Whether it's battling the Brotherhood of Evil Mutants in the shadow of Genosha, or clashing with X-Force during the X-Cutioner's Song saga, this unlikely band of heroes have team chemistry like nothing you've ever seen -- and a unique style of humor that makes this series a true classic! COLLECTING: X-Factor (1986) 55, 70-92; X-Factor Annual (1986) 7-8; Incredible Hulk (1968) 390-392; material from X-Factor Annual (1986) 5-6; New Mutants Annual (1984) 6

The X-Men fight crime and battle evil.

Peter David reinvents X-Factor -- again! Jamie Madrox has become a private eye. But with so many of his duplicates out in the world, is an identity crisis imminent? X-Factor Investigations recruits Guido, Wolfsbane, Siryn, M and Rictor -- plus Layla Miller, who knows stuff! But can the team help mutantkind navigate M-Day and deal with their unbalanced former ally Quicksilver? X-Factor butts heads with Singularity Investigations, X-Cell, the Isolationist and more. But what happens when two of Madrox's dupes want their own lives -- and when Jamie and Layla are thrown into the future? With Mutant Town under siege, Skrulls running rampant, personal problems tearing the team apart and a major change for Siryn, can X-Factor survive? COLLECTING: Madrox (2004) 1-5; X-Factor (2005) 1-20, 21-24 (A stories), 25-39; X-Factor: The Quick and the Dead One-Shot (2008); X-Factor Special: Layla Miller One-Shot (2008); She-Hulk (2005) 31

The divisiveness of the MU Civil War has spread to Jamie Madrox's X-Factor team.