Skaar was the progeny of the Hulk and of Caiera the Oldstrong. The blast that killed Caiera turned her into dust in the Hulk's arms. After her death a cocoon containing Skaar fell into the lake of fire. After a period of time, Skaar emerged from the cocoon, appearing to be the age equivalent of a human preteen. A year later and he appeared to have grown into a teenager. He quickly grew into what seemed to be an adult after he was attacked by the Axeman Bone Dragon's flame, which at first looked like an example of his old power.
Skaar defeated Axeman Bone and his dragon with only a sword and his bare hands. Skaar, after having a confrontation with the princess Omaka, was able to speak intelligent sentences when the group was going to be attacked by Wildebots and the two formed an alliance. After sometime, he gained the power of the Oldstrong with the help of his followers. Soon after, he found himself allied with the Former King, who was saved from death and rebuilt with a majority of cybernetic parts by the Wildebots. After becoming his ally, many of the people who considered him a savior, including Omaka, lost faith in him and allied themselves with Axeman Bone.
With his Oldstrong, he managed to see the acts of death committed by everyone on the planet and intended to kill Axeman and his followers, and almost succeeded, when the Silver Surfer made a sudden return and managed to take away his Oldstrong power and revealed that Galactus was coming to the planet to consume it. He opted Skaar the chance to use the oldstrong power to revive the ancient technology of the Shadows to evacuate the planet, becoming a hero of the universe as the planet Sakaar would have enough energy to satiate Galactus' hunger for a hundred thousand years.
His mother's spirit spoke to him asking him to fight for good of the people of the planet, but Skaar insisted on revenge, consumed with rage over Axeman Bone. Through one final plea of his mother's spirit, he was asked to give up his rage, but he instead proceeded into battle, with no regard for the innocent. Caiera, using what little of her strength she had left as a spirit, used her Oldstrong power to return in a stone form of herself initially, then in the image of his father. She proceeded to defeat him with ease and asked why he insisted on being a killer instead of a attempting to make peace. He then revealed his plan of killing everyone on the planet he deemed evil after glimpsing the destruction so many people made when he briefly wielded the power of Oldstrong.
His mother, offering him one last chance of redemption, made the Silver Surfer (still being controlled by an obedience disk) bring to Galactus a being who had killed billions in order to truly grasp if he was able to succeed at his plans, showing him the consequences of his actions would result in the death of everyone on the planet by the hands of Galactus with a vision. The Surfer sent him back to Sakaar after believing he saw things his way. Caiera returned to being one with the planet, believing Skaar had taken up the Silver Surfer on his previous offer of evacuating the planet and returned his old power to him to do so. Skaar then unsuspectingly used his newly returned old power to destroy the ships, dooming everyone on the planet. He chose that the planet and his mother's soul was more important than it's inhabitants. He gave the Surfer an ultimatum, spare Sakaar or he would use his old power to increase Galactus' hunger which would cause him to consume every planet the Surfer managed to save. The Surfer decided to leave, informing everyone on the planet of his actions and how they would be subsequently responsible for the deaths of billions. Caiera returned to him once more and denounced him as her son for his decision and exiled him from the planet. She then absorbed the power that made Sakaar and waited for Galactus to consume her.

Planet Skaar
uring the time of Skaar's exclusion from his planet, he had been warped to the solar plains of Earth. Mister Fantastic saw his arrival as well as the presumed Hulk daughter, Carmilla Black, foretelling of his gender and name to Norman Osborn. Arriving on Earth, he first attacked a helicopter for killing an innocent coyote. Running off to a desert like region, Skaar came into fight with his aunt, She-Hulk, and the Fantastic Four - Minus Sue Richards due of her holding off his father miles away. Later, a bomb sent by Osborn collided with the area the Four engaged battle and sent Skaar miles away. Transformed into what seemed to be his human-like form, Skaar was left in the wilderness. In his human form he met and befriended two local children. One of the siblings injured himself on a cliff and the younger sibling rushed to nearby police for help. Mistaking Skaar for a threat, one of the officers tasered him and proceeded with arresting him, provoking him to transform into his original form, causing his presence to be felt by his father several miles away. After running into and attacking the Warbound, Skaar asked to kill his father. As his father appeared immediately to confront him, Kate Waynesboro replied, "You don't."
The Hulk, possessing his Green Scar persona, confronted his son in battle. The Warbound initially decided not to interfere, but decided to intervene as Kate pointed out their battle was going to endanger a nearby power plant. Korg tried to calm the Hulk down but was instead assaulted, grabbed and hammered against Skaar. Afterword Korg told both of them to state their grievances. Skaar stated the reason he wanted revenge on Hulk was because he felt he abandoned him and his world to death. The Hulk responded in his savage persona, shouting while he kept talking, Skaar disgusted with his father's diminished intelligence asked if he even knew who he was. The Hulk exclaimed that he was the Hulk, the strongest one there is. Skaar, even further disappointed, claimed he had come to kill a "king not a clown". The Hulk then grabbed Skaar's face and began to remember Caiera and became World Breaker once more, but was pushed back into Bruce Banner's mind and regressed back into the savage Hulk. Skaar, wanting the scar to return was quickly ignored by the childlike incarnation and left. The Warbound were trying to stop a nuclear catastrophe at the nearby plant when they were unexpectedly aided by the Hulk and Skaar. Skaar, using the Oldpower, sealed the containment building and saved the workers at the plant. Elloe asked why he used the sword when he had the Old power. Skaar responded saying it was more fun, while impaling the Hulk. Skaar then left claiming he would come back when there was someone worth killing.
Skaar later encountered Bruce Banner, who had been robbed of the ability to become the Hulk by the Red Hulk. Bruce offered to teach Skaar how to kill the Hulk, should he ever return, and proceeded to pick a fight between Skaar and Juggernaut to help Skaar prepare for this confrontation. Skaar managed to win his first staged fight by throwing the Juggernaut into open space, proving to his father his ability to use cunningly his physical strength.
As a second lesson, devised to grant the still naive Skaar the ability to discern friend from foe, and confront his legacy as the scion of the Hulk, Banner used the recently met Wolverine to bring Daken and Skaar together. After a friendly chat, Skaar apparently asked Daken to kill him, forcing Banner to separate the two with an impromptu Fastball Special. The two fathers proceeded to separate their offspring, noting to each other how strange their parenting seeemed.
In the meanwhile Victoria Hand and Moonstone, still in Ms. Marvel garb, lured Banner and Skaar near an installation seemingly meant to siphon away his Oldstrong power. At first taking Victoria as his hostage, he freed the two women, gleefully acknowledging their real plan: rather than stripping him of his heritage, they wanted to recharge Banners physiology, accelerating the rebirth of the Hulk. Banner froze Skaar's childlike glee, noting that Skaar would still need training for his revenge.
Skaar later assists Hulk and A-Bomb into fighting Harpy. It turns out that the Harpy that attacked them isn't Betty Ross, but Marlo Chandler mutated into the Harpy by Leader.
Skaar and Bruce Banner later fight Tyrannus when he and his Moloids invade Manhattan. After defeating the Moloids, Skaar is proclaimed a hero. After Bruce speaks to his secret partner the Red Hulk, the Green Hulk is seen in Latveria battling Dr. Doom. The two duel for a bit before Doom prepares to strike down Hulk. Suddenly, Skaar bursts onto the scene and takes on Doom, with Doom overwhelming him with spells. When he holds Skaar's sword up to Hulk's neck, he blasts the distracted Skaar and prepares to kill him, reminding him that the Hulk is a robot. Banner comes through and neutralizes Doom's ability to use his armor and remember his spells, and saves Skaar from being killed. Skaar still refuses to trust Banner and angrily shrugs him off when Bruce tries to reach out to him. he next went to aid the avengers against red she hulk.At first being over powered by the Red She Hulk and losing Hank Pym in the process he and Bruce create a new team of avenger to help break into the Intel helicarrier in which once broken into he is forced to again battle Red She Hulk and then overpowered by her and protected from her by Bruce banner and after the Intel uses their cathexis ray and Skaar is shot out of the Helicarrier and fights the Hulked out heroes and protect Bruce from the Red She Hulk by stabbing her and to his,Rick, and Bruce's surprise she turns into Betty.....