1st printing. Collects New Mutants (1983-1991 1st Series) #26-28 and #44, Uncanny X-Men (1963-2011 1st Series) #253-255 and 278-280 and X-Factor (1986-1998 1st Series) #69-70.

Written by Chris Claremont, Fabian Nicieza, Peter David, and Jim Lee. Art by Bill Sienkiewicz, Jackson Guice, Marc Silvestri, Dan Green, Paul Smith, Andy Kubert, Scott Williams, Whilce Portacio, Kirk Jarvinen and Joe Rubinstein. Cover by Jim Lee.

David Haller is no ordinary mutant. Son of Charles Xavier, founder of the X-Men, David's incredible mental powers fractured his mind - and now, each of his personalities controls a different ability! And they're not all friendly, as Xavier and the New Mutants find out the hard way! But as Legion struggles to control the chaos in his head, he attracts the attention of one of Xavier's oldest and most malevolent foes: Amahl Farouk, the Shadow King, who's secretly been stalking and manipulating the X-Men and their allies. When the Shadow King sinks his hooks deep into David's mind, will two teams of X-Men be enough to defeat him - or will David be the key to the villain's ultimate victory?

Softcover, 328 pages, full color.