Origin

Teddy was raised by his single mother who really was a Skrull posing as a human who he believed to be his mother. Teddy did not know the true source of his power and assumed he was a Mutant.

He had hidden his powers afraid of the backlash that comes with being a mutant, that is until he met Greg Norris who was the class president and captain of the basketball team. Teddy soon confided in him about his power and to his shock Norris was not upset. Greg, used his friend's powers to pull cons and pranks using Teddy's powers to shape shift into popular figures.After hearing of the break-up of the Avengers, Teddy was shocked. Greg used him to go into the wreckage of the Avengers Mansion. Teddy was in awe of the place and respected it, while Greg just wanted to use Teddy to loot the place. Teddy threatened Greg using his powers and he left the mansion.

After Greg left, Teddy then met Kang who was gathering teens by using the Vision's fail-safe programing, to form a group of Young Avengers to fight Kang. Teddy agreed to join him and become Hulkling alongside Iron Lad (Kang), Stature (Cassie Lang), Patriot (Eli Bradley), Hawkeye and Wiccan (Billy Kaplan) with whom he kindled a close relationship.

After the Patriot quit the team the rest tried to talk him into coming back. While this happened, Hulkling was abducted by the Super-Skrull who said that Teddy was a Skrull himself and he had come to take him back. After a battle the group (minus Eli) escaped to Wiccan's house where they found who they thought was Hulkling's mother, but before anything could be made clear the Super-Skrull broke in with the Patriot as a hostage ordering Hulkling to come with him. The Super-Skrull then used a device that was supposedly supposed to reveal that Teddy was a Skrull but instead revealed that his mother was a Skrull. She stated that she was ordered by the Empress to protect Teddy and shot at the Super-Skrull who retaliated by setting her on fire, resulting in her death.

The Super-Skrull then took Hulkling and told him was Dorrek VIII and the son of Anelle, the Skrull Emperor's daughter, and the only heir to the Skrull empire. But the Emperor had ordered the child's death upon learning who his father was so Teddy was sent to Earth to be reunited with his father. Before the Super-Skrull could tell Hulkling who his father was, the other Young Avengers arrived to save Hulkling. Kree soldiers suddenly appeared claiming that Hulkling was Kree. The Kree soldiers then said that Hulkling was the son of Captain Marvel and by law had to join the Kree army, but Hulkling refused and a battle broke out.

The Young Avengers fled, but then found themselves in the middle of another battle as Skrull and Kree Troops both appeared demanding that Hulkling come with them, but the the Avengers came to the rescue. The conflict was resolved when the Hulkling and the Super-Skrull switched identities and "Hulkling" agreed to a deal in which he would spend 6 months with the Kree and 6 months with the Skrulls before making a decision on who he would side with. The arrangement was still in order when the races left and Teddy returned to his original form, safe from both races and staying in Earth. After all was done Teddy scattered the ashes of his foster mother to the breeze at the Avenger's Mansion.

Teddy recently confronted his father ( Captain Marvel) because of his return. They had a large heart to heart, and Teddy now knows what it is like to have a father.  However, unknown to Teddy, this Captain America was actually a Skrull appointed to impersonate Captain Marvel.  Due to an accident, the Skrull agent truly believed himself to be Captain Marvel.

Powers

As part-Skrull, Hulking is able to change his appearance by altering his size, shape, and color. When he increases his mass his strength also increases. He typically manifests claws and wings as necessary in battle. His Skrull physiology also gives him the ability to heal from injury at an accelerated rate and sub-consciously move and reshape his vital organs to protect himself from mortal damage.

Teddy's shape-shifting abilities are detailed enough to bypass highly sensitive eye-scans and voice-scans.

As part-Kree, Hulkling also possesses super strength.

Alternate Realities

Earth-721

Wiccan and Hulkling from the reality known as Earth A, came to Earth-616 as tourists and registered in the Initiative. The Wiccan and Hulkling of Earth-616 didn't approve of this, and later Wiccan and Hulkling from Earth-721 were sent home when the portal between worlds was closed.