Living on the streets, he is kidnapped by the conspiratorial Secret Empire and subjected to experimentation that alters his mind and body and makes him mentally unstable and prone to violent and animalistic behavior.

During this time, he becomes acquainted with Dr. Valerie Cooper, a United States government official who is unaware of the Secret Empire's true nature or activities.

Gibney (now Wild Child) is detained by the military and given over to the custody of Canada's secret Department H, who oversees the formative Alpha Flight team.

[5] Afterwards, he commits a series of murders, which ends when he battles and is captured by Wolverine after he severely injures and almost kills Alpha Flight member Heather Hudson.

[10] Department H would later help him overcome his psychological problems and cure his mental illness, train him in unarmed combat, and place him as a special operative of the Canadian government assigned to Alpha Flight under the codename Weapon Omega.

[volume & issue needed] His appearance eventually deteriorates back to his initial feral form, which prompts him to leave Alpha Flight and Aurora.

When Wild Child mocks his burns, Sabretooth slits his vocal cords and threatens to kill any Weapon X medical staff who would operate on him, making sure that he would remain mute.

After the Weapon X upgrades she becomes cocky and aloof, snubbing the ugly Wild Child and even engaging in a relationship with the horribly disfigured Director of the program.

Omega Red succeeded in distracting Wild Child and thus was able to impale him on his coils before throwing him into a vat of molten steel.

[25] Kyle Gibney joins a loose group of outcast mutants, operating under Mister Sinister: the Hellions, which also comprise Havok, Kwannon, Empath, John Greycrow, Nanny, and Orphan Maker.

He also has various animal-like mutations common for "feral" mutants: leaf-shaped ears; eyes with neither pupils nor irises; sharper-than-normal teeth with pronounced, fang-like canines; and elongated fingernails and toenails which can be used as claw-like weapons, as well as his hunched body posture.

For a time, he was Sabretooth's sidekick, as Creed had rescued Wild Child from being a prisoner of Apocalypse's son Holocaust but his current fate is unknown.

The 2005 Handbook to the Age of Apocalypse states that Kyle is away on a secret mission with the other X-Men who were not present during the Age of Apocalypse 10th Anniversary Limited Series, though when Sabretooth and Blink revisited their home reality during a mission as Exiles, Magneto and Rogue revealed to them that Kyle had run away after Victor and Clarice had disappeared when they were taken away by the Tallus.

[31] In the House of M reality, Wild Child (alongside Arclight and Mentallo) is a Red Guard member positioned in Australia to serve Exodus.

[33] In the pages of Avengers of the Wastelands that serve as a sequel of "Old Man Logan" and take place on Earth-21923, Wild Child is among the villains that attack Danielle Cage's group in Osborn County where they were killed by the insects summoned by Dwight Barrett's Ant-Man helmet.

[36] Wild Child makes a non-speaking cameo appearance in the X-Men: The Animated Series episode "One Man's Worth" as a member of Magneto's mutant resistance.