Gamora is the sole survivor of the Zen-Whoberis, following their extermination by the Universal Church of Truth, who worshipped the Magus. As an orphan child, Gamora was adopted by Thanos, who brought her to the past in order to forge her from victim into the killer of the Magus. Under Thanos' care, Gamora was trained as an elite assassin and had her body mechanically improved. Over the years, she built herself a reputation as the deadliest woman in the galaxy.
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History
Gamora's mission eventually led her to meet Adam Warlock, the Magus' younger self. As a temporal anomaly, Gamora's help was crucial for Warlock and Thanos to defeat the Magus. With the Magus defeated, Gamora questioned her father's macabre obsession with death and ultimately betrayed him, joining Warlock.
Alongside Warlock, she became a regular player in major cosmic adventures, becoming a member of his Infinity Watch and being a protector of the Time Stone. During the Annihilation Wave invasion, Gamora got close with other cosmic protectors, such as Nova, whom she got romantically involved with. After Hala was conquered by the Phalanx and Ultron, Gamora was invited by Peter Quill to be part of a team of protectors to act in a preventive manner against galactic threats, the Guardians of the Galaxy.
For years Gamora was seen as a true hero, until the return of the Infinity Stones made her follow her father's goals. Adopting a new identity as Requiem, Gamora killed Thanos and started her quest for the Infinity Stones. After collecting the stones by betraying her former friends, she folded the universe into the Warp World, but was eventually defeated. Gamora was ultimately forgiven by her former allies and rejoined the Guardians of the Galaxy to prevent Thanos' resurrection.