X-Factor Omnibus by Peter David

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 has team chemistry like nothing you've ever seen - and a unique style of humor that makes this series a true classic!
Collects X-Factor (1986-1998 1st Series) #55, 70-92 and X-Factor (1986-1998 1st Series) Annual #7-8; The Incredible Hulk (1962-1999 1st Series) #390-392; and material from X-Factor (1986-1988 1st Series) Annual #5-6 and The New Mutants (1983-1991 1st Series) Annual #6.