Legion's Yellow-Eyed Demon was revealed to be a classic X-Men villain. 1 / 7
His name is Amahl Farouk, aka the Shadow King. 2 / 7
Just as in the comics, he has ties to Charles Xavier. 3 / 7
In the show, he'd been sharing David's mind since infancy. 4 / 7
The Shadow King kept David ignorant until he could no longer hide himself. 5 / 7
His relationship with David has evolved quite a bit since then. 6 / 7
Things have really shifted now that David has become the villain of his own story. 7 / 7