Who - or what - is Ultimate X? The answers and even more secrets arrive in the all new ULTIMATE X ongoing bi-monthly series from the superstar dream team of JEPH LOEB and ART ADAMS. Wolverine is dead. Captain America is a fugitive. The Fantastic Four disbanded. Lives have been destroyed and nothing can ever be the same - is there any hope left? It all begins with a search for a brand new character whose identity will leave jaws on the floor and change the Ultimate Universe forever.
— Description from Comic Vine community (comicvine.gamespot.com).
