The first nemesis of the current generation of Ultimate X-Men returns in Ultimate X-Men #14, with the Shadow King coming back to menace the young team. For those not in the know, the current Ultimate X-Men are part of a new relaunch of the Ultimate Universe, though they exist somewhat in their own corner of the new timeline.
Rather than an adaptation of the classic X-Men of the core Marvel Universe, some of whom have appeared elsewhere in the new Ultimate continuity, the Ultimate X-Men are a collection of young mutants led by Armor who have run afoul of a dire mutant cult.
Their first enemy, the Shadow King, is part of that group, using his powers of psychic shadow projection and telepathy to menace the freshly formed X-Men.
Here's the preview of interior pages by writer and artist Peach Momoko, script adaptor Zack Davisson, and letterer Travis Lanham, which pay homage to the iconic cover of Uncanny X-Men #251 with Wolverine strapped to the x-shaped cross, which was also adapted in Deadpool and Wolverine:
