The Fall of X has begun, and that means nowhere is safe for Marvel's mutant population. On Earth, the mutant nation of Krakoa was destroyed thanks in part to the murderous machinations of the organization known as Orchis, and its survivors have been targeted for imprisonment and execution. The mutants of the planet formerly known as Mars, and now known as Arakko, face a different but just as dangerous form of peril; the return of Arakko's former despotic ruler Genesis who has come to reclaim her kingdom with an army that includes her husband Apocalypse, and their children, the Four Horsemen.
Source：https://www.cbr.com/xmen-red-genesis-war-al-ewing-interview/
