Peter Jason Quill is a Celestial-Human hybrid who was abducted from Earth in 1988 by the Yondu Ravager Clan, eventually building a reputation as the notorious intergalactic outlaw Star-Lord.
In 2014, he decided to leave the Ravagers and operate individually, unintentionally becoming a key player in the quest for a precious artifact known as the Orb after stealing it from Morag. Following his arrest, he forged an uneasy alliance with fellow inmates Gamora, Drax the Destroyer, Rocket Raccoon, and Groot, who together formed the Guardians of the Galaxy.
They first rallied as a team by stopping Ronan the Accuser from destroying Xandar with the Power Stone.
A few months later, Ayesha and the Sovereign hired Quill and the other Guardians to defend Anulax Batteries from an Abilisk. However, after Rocket stole some of the batteries, Ayesha sent the Sovereign fleet after them.
The Guardians were saved when the fleet was destroyed by Ego, Quill's biological father, whom Quill had never met before. Quill then spent a few days bonding with his father. However, when Ego revealed that he was responsible for the death of Meredith Quill (Quill's mother), Quill allied with his fellow Guardians to prevent Ego's quest to terraform the universe.
After killing Ego and witnessing Yondu Udonta's sacrifice, Quill continued to lead the Guardians of the Galaxy and eventually started a relationship with Gamora.
The Guardians of the Galaxy then encountered Thor and began racing against Thanos to procure the Infinity Stones.
Splitting up into two groups, Quill led Gamora, Drax, and Mantis to Knowhere to recover the Reality Stone from the Collector, only to lose both it and Gamora to Thanos.
Quill, Drax, and Mantis later traveled to Titan to confront Thanos in person. With help from Iron Man, Doctor Strange, and Spider-Man, the Guardians fought Thanos, during which Quill was devastated to learn that Thanos had killed Gamora.
In his anger, Quill unintentionally gave Thanos an opening to strike back, and Quill, alongside his allies, was ultimately defeated. Thanos eventually succeeded in his goal and wiped out half of all life in the universe; Quill and most of the Guardians of the Galaxy were among the victims.
In 2023, five years after his death, Quill was resurrected along with all the other lives claimed by the Snap. He then returned to Earth with the help of Strange, participating in the Battle of Earth, where he encountered a Gamora from an alternate timeline.
After the battle, Quill attended Stark's funeral with the Guardians. Quill and the team then flew to New Asgard to retrieve Thor, who had decided to join the Guardians, as Quill continued to search for the alternate Gamora.