Gamora is a former Zehoberei assassin and a former member of the Guardians of the Galaxy. She became the adopted daughter of Thanos and adopted sister of Nebula after he killed half of her race. She served him for years before betraying him in an attempt to free herself from his ways. She was hired to steal the Orb, and became caught up in the Quest for the Orb, becoming friends with the other members of the Guardians of the Galaxy. After the Battle of Xandar, she left to work with them all. Having made a deal with the Sovereign to kill the Abilisk, Gamora was able to take back custody of Nebula with the intention of finally bringing her to justice in Xandar.