The X-Men have been dealing with many threats as they steadily approach Fall of X — with plenty of enemies around the world preparing to bring down the mutant nation once and for all. This includes multiple versions of Nathaniel Essex, even as Mister Sinister himself has been exiled from Krakoa. One of these threats might be a bigger danger to the entire Marvel Universe than anyone truly realizes.
Source：https://www.cbr.com/xmen-doctor-stasis-marvel-hero-origins/
