76 pages of Mutant Mayhem!
Something is seriously wrong with the X-Men's history, and the Blue Team are in big trouble! Guest-starring Generation X! By Cullen Bunn & RB Silva!
The Gold Team enter the Negative Zone to rescue Kitty and Nightcrawler! By Marc Guggenheim & Ken Lashley!
Featuring material first printed in X-Men: Gold #17 and X-Men: Blue #17-19.
— Description from Comic Vine community (comicvine.gamespot.com).
