Finding himself on Earth and unaware of his own past, Adam-X began working for industrialist Martin Strong helping bring mutants to a Strong Industries plant where he would seemingly give them shelter. In exchange, Strong promises to help Adam-X regain his identity. During this time, Adam-X develops a close friendship with fellow mutant
Michelle Balters, also known as Neurotap. Unbeknown to Adam-X, Strong Industries was, in actuality, funded by
Project Wideawake to develop a means to exterminate the "X" gene that makes mutants. Discovering the truth, Balters flees from Strong Industries and Adam-X is sent to bring her back in.
X-Force had already begun investigating Strong's activities when they cross paths with Balters. X-Force attempted to preserve Balters' freedom but they were momentarily incapacitated by Adam-X's mutant ability. Balters is able to escape with X-Force and provide him with information about Strong. Although initially meeting as adversaries, Adam-X and X-Force eventually join to combat Martin Strong, once they discover that he is a mutant himself. Adam-X and
Shatterstar, in particular, discover a mutual affinity due to their alien mutant status and love of battle. X-Force membership is offered to Adam-X but he declines, choosing instead to find his past and find who he is. For unknown reasons,
Mister Sinister, under the pseudonym of Mr. Milbury, hires
Arcade to "test" Adam-X. At the same time,
Major Domo hires Arcade to get rid of Shatterstar. Arcade decides to meet the demands of both employers by capturing the two and pit them against one another in Murderworld. After yet again battling one another briefly, Adam-X and Shatterstar join forces and work their way through Murderworld and defeat Arcade. While traveling in the
Canadian Yukon wilderness, Adam-X witnesses Phillip Summers' plane crash. Adam-X is able to rescue Summers before his plane explodes. Adam-X uses his mutant power to "heat" Summers' blood and keep him warm until he finally manages to carry him to a hospital. They are greeted by Summers' grandson,
Cyclops and Cyclops' wife,
Jean Grey. The two
X-Men thank Adam-X for his efforts and, using Jean's telepathy, Adam-X is able to share some of his memories with Phillip, showing him the ships he flew while with the Shi'ar. Adam-X meets
Captain Marvel, and the two encounter Shi'ar agent Davan Shakari (aka
Erik the Red). Shakari reveals that Adam-X is the human/Shi'ar hybrid son of Emperor
D'Ken. Adam-X kills Shakari.
Dark Reign Years later, Adam-X finally returns in San Francisco, sitting drunk in a bar with other mutants. He is angry that humans are trying to prevent new mutant births and he participates in a riot. Adam is later arrested by
Emma Frost and her
Dark X-Men. They are taken into custody by the Dark X-Men. He and the other prisoners are freed by
X-Force and teleported to the island of Utopia.
S.W.O.R.D. Adam-X is one of the many aliens arrested under orders from
Henry Peter Gyrich, who had orchestrated a coup with the alien-monitoring agency
S.W.O.R.D. He is imprisoned with many other earth-dwelling aliens, such as
Beta Ray Bill and
Ultra Girl. All the aliens are released by
Abigail Brand, the former leader of S.W.O.R.D. Adam-X assists in driving off an alien invasion and is allowed his freedom. Brand, now in control again, clarifies she owes each of them a one-time favor.
Fear Itself Among the over 50 plans Cyclops utilized to try to stop
Juggernaut, Adam X was used to ignite Juggernaut's blood. The result was "worse than ineffective" as Juggernaut remained unstoppable, and for 15 minutes, burned anything he touched.
Summers family The anthology title
X-Men Legends reveals that Adam is genetically related to the Summers family, as genetic information from Katherine Summers was used in his creation. ==Powers and abilities==