Created by writer Roy Thomas and artist Werner Roth, the character first appeared in The X-Men #35 (Aug.

Although dying at the end of this run, he was thought to have been seen as a ghost in Excalibur: The Possession (1991) and returned as a zombie in The Sensational She-Hulk #34–35 (1991–1992).

According to showrunner Eric Lewald's behind-the-scenes book, Previously on X-Men: The Making of an Animated Series, the creators (including writer Mark Edward Edens) had intended for Thunderbird to be the series' early sacrifice, but they became uncomfortable with the idea of killing off a Native American character.

Sydney's codename was changed to Morph because DC Comics owned the trademark to "Changeling" when the series debuted.

[2] Morph's first comic book appearance was 1992's X-Men Adventures #1, which adapted the "Night of the Sentinels" TV pilot.

Then in 1995, inspired by the character in the animated series, a new Morph was featured in the "Age of Apocalypse" crossover event, debuting in the one-shot comic X-Men Alpha.

[5] He divulged to Professor X that he was suffering from an unspecified terminal illness with only a few months left to live and wished to atone for his misdeeds.

He was mortally wounded in battle with Grotesk by the explosion of an oscillotron machine and, consequently, died preventing the destruction of Earth.

Angry that he used his remaining time helping the X-Men instead of seeking a cure for himself, Changeling sought revenge against Professor X.

[11] Changeling is later raised from the dead as a zombie by Black Talon to form part of the team X-Humed (which also consisted of Harry Leland, Living Diamond, and Scaleface), and used to attack She-Hulk.

He is able to break Talon's control of him long enough to allow She-Hulk to win and lay the zombies back to rest.

His mother died of lung cancer and Morph tried in every way to cheer up his emotionally distraught father (often acting in a childish way whenever his father wanted him to act serious), who, unable to let his suffering go, chose to enroll his son in a boarding school; luckily, that school happened to be the Xavier Institute for Higher Learning.

He was instrumental in many of the team's victories and was chosen to be part of a pilot program with the Avengers, along with the Beast, as a public representative of mutant-kind.

In that new reality a wounded Morph is unable to maintain his form, and is in a coma, being only a white muddy substance in Beast's lab.

When the Exiles tracked him to the "Heroes Reborn" world, cosmic entities "O" and "K" kidnapped him, saying his presence has tipped the balance of power.

[volume & issue needed] During a confrontation where Proteus reawakened, he found himself lacking in power to defeat the adversary.

In a vision, he saw a figure, almost identical to his own true, energy form, telling him to take its hand, and he would survive.

[19] Kevin Sydney is a mutant metamorph with the ability to alter his physical appearance and voice at will to resemble that of any person he chooses.

[citation needed] Upon choosing to work together and share his body with the energy mutant Proteus, Morph's powers appear to be amplified, at least enough to defeat a self-proclaimed god.

Kevin Sydney is a skilled actor, and a highly trained and efficient organizer of subversive activities.

In the "Age of Apocalypse", Morph was, like his "regular Marvel Universe" counterpart Changeling, an early recruit of the X-Men.

For example, he morphed into Sabretooth in an effort to comfort Blink while she doubted her abilities, and he later gave Rogue the strength to endure against the horseman Holocaust by acting as her son.

[volume & issue needed] Shortly after the defeat of Apocalypse, he accompanied fellow X-Men Iceman, Wildchild and Exodus on an unspecified mission, during which they disappeared.

[volume & issue needed] A Morph is also seen as a member of First Line, set in Earth-616 but in the period after World War II.