Born in Los Angeles, California, to parents who managed to work their way out of poverty to become billionaires, Julian was sent to the Xavier Institute in hopes that he would learn to use his powers with some discretion.

A fast favorite of headmistress Emma Frost, who sees in him great potential for heroism as well as a frightening disposition for personal gain and villainy, Julian named himself 'Hellion' in tribute to the former White Queen's first class of students (who had been killed by Trevor Fitzroy).

[volume & issue needed] Hellion has demonstrated quite a significant interest in Sofia Mantega, co-leader of the rival New Mutants squad.

While Sofia became more rebellious, even helping the Hellions attempt to break Wither out of jail, Julian became more sensitive and more comfortable with his emotions.

[volume & issue needed] He had an on-and-off friendship with Elixir, initially befriending him until he learned of his past as a Reaver.

[volume & issue needed] Despite his tumultuous relationship with the New Mutants, he was the one who encouraged Sofia to put her squad back together when they were on the brink of disbanding.

[volume & issue needed] In the aftermath of M-Day, the previous squad system has been abandoned due to the diminished number of powered students.

[1] When Sofia overheard Julian saying the depowered David Alleyne no longer belonged at the institute, the also now human Mantega ended her relationship with Keller.

[volume & issue needed] Julian, having trouble with his powers, is practicing with Beast in the Danger Room when he accidentally blows a hole in the floor.

After taking a shower, he goes looking for Mercury when he comes across Loa, Rockslide, and Anole watching the Young Avengers on TV.

After a brief fight, Julian throws Kimura a few miles away and together they find Mercury; when they are confronted by a bunch of Predator Xs, one injures his shoulder.

While he and Surge argue about his reckless disregard for her leadership by leaving with X-23 to save Mercury and not telling her, the other students inside the X-Mansion get transported to Limbo while they are still outside.

Afterwards, he and Mercury are with the Stepford Cuckoos trying to locate the youngest mutant on the planet when Emma Frost asks to see them both for an interview.

Julian immediately panics, claiming Cessily and Sooraya would never have left him, and asks where Laura is, but Emma tells him that everyone is being taken care of.

When Julian awakens again, Emma is gone and he tries to go back home, only to find his parents have put their house up for sale and moved without telling him.

Before Wolverine can kill the Leper Queen and save Julian, Nori, and Boom-Boom, X-Force is teleported out by Cyclops.

[14] When anti-mutant protesters led by Simon Trask march in San Francisco in support of Proposition X, Julian and a number of other mutants attempt to stall their demonstration.

In the process, Osborn forms his own team of X-Men led by Hellion's former mentor, Emma Frost, and institutes a curfew on the city.

Believing this to be a last stand for mutant rights, Hellion gathers a group at a bar owned by the former X-Villain Avalanche with the intent to break curfew and get arrested on TV in non-violent protest.

The group fails to make its intended point as Match torches the surrounding area with his powers, and Hellion is arrested by Emma Frost and her Dark X-Men.

[volume & issue needed] During the "Necrosha" storyline, Hellion is seen with Surge and Prodigy, fighting the resurrected Rusty Collins.

He is placed on life support prior to being shipped to Namor's underwater Atlantean colony for reasons of safety and protection.

[18] After the Nimrod fleet is destroyed and Hope defeats Bastion, Hellion confronts her, bitter about his injuries, but is rebuffed by Magneto.

[20] During the ensuing battle, Hellion's powers manifest uniquely as he is able to feel the telekinetic wave and the objects it touches down to their sub-atomic structures, moving it through the empty space within atoms to hit a target behind them.

After momentarily disposing of Hellion when he is distracted by the other X-Men, who think he initiated the attack, Karima defeats the team and begins procedures to kill them off, but Hellion engages her a second time in a short and brutal assault fueled by his repressed rage, crushing her in battle.

Her human side briefly reasserts itself during the fight, asking Hellion to put her out of her misery and stop her from harming others.

[24] 8 months after the events of the "Secret Wars" storyline, Hellion is shown to be dying of the M-Pox disease after accidentally coming in contact with the Terrigen Mist.

When Emma unlocked subconscious blocks on his mutant ability, Hellion was able to reach a flight speed several times the speed of sound, faster than one of the O*N*E Sentinel pilots believed possible and destroyed a Sentinel by telekinetically hurling an armored wagon through it, but was severely injured from the physical strain afterward.

In contrast to most other possessors of extremely strong and powerful telekinesis, Hellion tends to focus and channel his telekinetic energy almost exclusively through his hands, very rarely projecting it as a free flow output directly from his brain.

She notes that the perception of living a lifetime in that world has allowed Hellion to refine his much stronger telekinetic abilities to fully control and manipulate the artificial hands created for him, a feat that normally could not be accomplished in Julian's condition before the Age of X reality.