"Legion--the most powerful and unstable mutant in the world, and son to Professor Charles Xavier--finally attempts to tame his fractured mind, conquer his inner demons and embrace his father's legacy! First, Legion tries to help newly manifested mutant twins, exploited by a criminal cartel in Japan. But the twins have plans of their own, as do Legion's inner demons! Then, two new villains have begun plotting Legion's demise. But little does he know one of them is lurking within his own psyche, and the other is hiding among the X-Men themselves! Legion infiltrates the Jean Grey School for Higher Learning, but when he learns the demon in his brain has a horrifyingly familier face, can he and the X-Men help one another overcome it?" --p.[4] of cover.

Contains material originally published in 2012-2013 in single magazine form as X-Men Legacy #1-6.