Guardians of the Galaxy Vol. 3

At their new headquarters on Knowhere, the Guardians of the Galaxy are attacked by Adam Warlock, a Sovereign warrior created by High Priestess Ayesha who seeks to destroy them for stealing from her. After critically wounding Rocket, Adam is stabbed by Nebula and flees. The Guardians' med-packs are ineffective at healing Rocket's wounds due to a kill switch embedded in him by the organization Orgocorp. The Guardians travel to Orgocorp's headquarters to find the switch's override code and save Rocket's life.
As Rocket lies dying, he recalls his past. He was found and experimented on as a baby raccoon by the High Evolutionary, leader of Orgocorp, who aimed to enhance and anthropomorphize animal lifeforms into "Humanimals" for an ideal society, Counter-Earth. Rocket's fellow Batch 89 test subjects included the otter Lylla, walrus Teefs, and rabbit Floor. Rocket's insights were used to improve later batches of Humanimals, although the High Evolutionary was angry that one of his creations could solve a problem that he could not. The High Evolutionary planned to harvest Rocket's brain and incinerate all of Batch 89. Rocket tried to rescue his friends, but the High Evolutionary killed Lylla and mocked Rocket's grief. Enraged, Rocket attacked the High Evolutionary while henchmen killed Teefs and Floor during the chaos. Rocket killed the henchmen and then escaped in a spaceship.
In the present, an alternate version of Gamora, who has joined the Ravagers, helps the Guardians infiltrate Orgocorp. They retrieve Rocket's file but discover that Theel, one of the High Evolutionary's advisors, has removed the override code. The Guardians and Gamora travel to Counter-Earth to find him. They are followed by Ayesha and Adam after the High Evolutionary, their race's creator, threatened to wipe out the Sovereign if they failed to retrieve Rocket. At Counter-Earth, Drax and Mantis remain with Gamora and Rocket while Peter Quill, Groot, and Nebula go to the High Evolutionary's Arête Laboratories complex. Guards force Nebula to wait outside due to her cybernetic enhancements; Quill and Groot enter Arête. Drax tricks Mantis into pursuing Quill's group and Gamora saves Rocket from Adam and War Pig, one of the High Evolutionary's Hellspawn guards.
The High Evolutionary agrees with Quill that Counter-Earth is imperfect and begins bombarding the entire planet, killing the Humanimals and Ayesha. Arête, which is actually a spaceship, departs as Nebula, Drax, and Mantis board it to rescue Quill and Groot. However, the latter pair jump off the spaceship with Theel, whom they kill before retrieving the override code from his corpse. They are rescued by Gamora on their ship. As they use the code, Rocket flatlines and has a near-death experience in which he reunites with Lylla, Teefs, and Floor. Lylla tells him his time has not yet come, and Quill succeeds in disabling the kill switch and restarting Rocket's heart.
Drax, Nebula, and Mantis encounter the High Evolutionary's next batch of test subjects—genetically modified humanoid children—before they are captured. The other Guardians orchestrate a rescue, which leads to a battle against the High Evolutionary's forces. Kraglin opens fire on Arête with Knowhere and then helps to save Knowhere citizens from a counter-attack by the High Evolutionary's Hellspawn. Intent on retreat, the High Evolutionary's crew mutinies, but their leader kills them. Drax, Nebula, and Mantis befriend three monstrous Abilisks to escape and reunite with the rest of the Guardians. The Guardians delay leaving Arête, choosing to rescue the children, who escape to Knowhere via a tunnel constructed by Cosmo's telekinesis. Rocket discovers imprisoned animals on the ship and is confronted by the High Evolutionary, whom the other Guardians defeat. Rocket spares the High Evolutionary, and the Guardians help the animals escape to Knowhere. Quill nearly dies trying to reach Knowhere but is saved by Adam, whom Groot had earlier rescued from Arête's destruction.
Quill decides to leave the Guardians, names Rocket as the new captain, and reunites with his grandfather Jason on Earth. Mantis embarks on a journey of self-discovery with the Abilisks, Gamora rejoins the Ravagers, and Nebula and Drax remain on Knowhere to raise the rescued children. The new Guardians—Rocket, Groot, Kraglin, Cosmo, Adam, Phyla (one of the rescued children), and Adam's pet Blurp—later take on a mission.