Intended to be the third Summers brother, Adam-X's mother was Katherine Summers who was abducted by 'D'Ken, the Shi'ar emperor, his father. Eric The Red revealed to X-Treme that he was the heir to D'Ken's Shi'ar throne. After his mother was murdered by D'Ken, Adam-X was raised by a farmer named Jonath on the planet Ch'reesharaa.

After crashing on Earth he worked for Martin Strong's Strong Industries as a hound before running into X-Force who convinced him to turn on his employer who was seeking to cure mutants as part of Project Wideawake.

He later fought with Shatterstar through Arcade's Murderworld as part of a test put on by Mr. Sinister (or at least someone using his pseudonym "Milbury") who had taken an interest in both of them.

He next showed up in Alaska saving Philip Summers who crashed his plane during a blizzard. Adam-X saved Summers' life and later met in the hospital Jean Grey and Cyclops. The meeting was shown to have been observed by both Erik the Red and Mr. Sinister.

His status is currently up in the air due to Marvel editors not wanting to use his codename "X-Treme" and he hasn't shown up in over a decade.