Subject 89P13 is a raccoon who was genetically and cybernetically modified by the High Evolutionary, giving him enhanced intelligence and the ability to speak. Naming himself Rocket, he befriended fellow Halfworlders Lylla, Teefs and Floor, with the four believing they would soon be allowed to live in peace on a new planet. Whilst aiding High Evolutionary in perfecting his experiments, Rocket discovered that he, along with his friends, were slated to be killed. Rocket attempted to free his friends, only for the High Evolutionary to kill Lylla. Rocket then attacked his former master, mutilating him, which inadvertently resulted in the deaths of Teefs and Floor. Afterwards, Rocket boarded a ship and fled into the cosmos. While traveling the galaxy, Rocket befriended Groot, and the pair committed crimes and picked up bounties. In 2014, they met Star-Lord, who convinced them to assist him in selling the Orb, which was being sought after by Ronan the Accuser, for a massive profit. However, when they discovered that the Orb contained the Power Stone, Rocket was convinced to risk everything to stop Ronan's plans from using the Infinity Stone to destroy Xandar. During the ensuing conflict, Rocket managed to assist his friends in destroying Ronan, although this resulted in Groot being killed. Rocket then became a member of the Guardians of the Galaxy alongside the newly planted baby Groot. Rocket continued working with the Guardians when they were hired by the Sovereign to slay an Abilisk. However, Rocket took the job as a way to steal Anulax Batteries with the intention to later sell them. This angered Ayesha, causing her to declare war on the Guardians and hire the Ravagers to capture them. Rocket and Groot were soon captured by Taserface under Yondu Udonta's command, forcing Rocket and Udonta to work together in order to break free and kill Taserface. During his time with Udonta, Rocket learned how to better himself and wishing to save his Guardians family, joined Udonta during the Battle on Ego's Planet. Four years later, the Guardians rescued Thor after the Asgardians were slaughtered by Thanos, who had initiated the Infinity War. The Guardians split up; while the rest of the team returned to Knowhere to find the Reality Stone, Rocket and Groot accompanied Thor to Nidavellir to obtain Stormbreaker. Using the Bifrost Bridge, the trio traveled to Earth to join the Battle of Wakanda, where he fought alongside Winter Soldier. Their efforts to stop Thanos were unsuccessful, and Rocket was one of the only Guardians to survive Thanos' subsequent mass slaughter, along with Nebula. Rocket joined the Avengers on their trip to the Garden, where he witnessed Thor decapitate Thanos. Rocket spent the next five years as a member of the Avengers under the command of Natasha Romanoff. In 2023, after discovering how to traverse through time safely, Rocket and Thor traveled back in time to 2013, where he extracted the Aether from Jane Foster on Asgard. With all six Infinity Stones used to resurrect the victims of the Snap, Rocket participated in the Battle of Earth against an alternate Thanos and his army. After attending Iron Man's funeral, Rocket left the Avengers and rejoined the Guardians, preparing to leave Earth and return to their cosmic adventures. Rocket and the Guardians went on several missions with Thor, including the Battle of Indigarr. However, following the threat of Gorr the God Butcher, Thor left the team to help the Asgardians while Rocket and the other Guardians returned to the cosmos. After buying Knowhere from the Collector, Rocket worked with Cosmo to rebuild it, and on one occasion, they celebrated Christmas with Kevin Bacon. Shortly after rebuilding Knowhere, the facility was attacked by Adam Warlock, who mortally wounded Rocket whilst trying to retrieve him for High Evolutionary. Any attempt to heal Rocket was found to be fatal due to his cybernetic implants, prompting the rest of the Guardians to look into Rocket's past to be able to save him. They were ultimately successful and Rocket joined his friends as they sought to liberate the rest of High Evolutionary's experiments. Upon learning that he was indeed a raccoon, he dubbed himself Rocket Raccoon and joined his fellow Guardians in a battle against his former creator, whom he chose to spare. Following the battle, the other Guardians left the team, including Star-Lord, who appointed Rocket as the new team's leader. Rocket then led the new iteration of the Guardians comprised of himself, Groot, Obfonteri, Cosmo along with Adam Warlock, Phyla and Blurp joining as they continued protecting the galaxy.