"Adam Warlock (Earth-90266)" VS "Adam Warlock (Earth-94241)"
Adam Warlock (Earth-90266)
When Thanos acquired the Infinity Gauntlet, he used it to wipe out beings in the universe in an effort to appease Death. Warlock teamed up with Doctor Strange and Silver Surfer to oppose him and went to enlist the New Fantastic Four for help. Warlock would not reveal the plan and so the New Fantastic Four did not trust them and the group left. Their plan amounted to the Silver Surfer attempting to steal the gauntlet from Thanos. Wolverine (then pretending to be loyal to Thanos), alerted him to Surfer's arrival, but Thanos already sensed it and effortlessly vaporized him. The fate of the Warlock is unknown but after Thanos was defeated by the New Fantastic Four and Spider-Man acquired the Infinity Gauntlet, all of those killed by Thanos (save Mephisto), were resurrected.
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Adam Warlock (Earth-94241)
According to himself, the Soul Stone chose Adam Warlock as its wielder. He used its power to keep the Annihilation Wave at bay from a sanctuary called Magus City. However, Magus City was no simple sanctuary, as Warlock had also used the Soul Stone to control and influence the actions of every single one of its inhabitants. Warlock used the Stone additionally to keep a giant behemoth bug under his control. With the power of the Stone, Warlock was able to sense the Bakian Clan's arrival to Magus City in order to retrieve the Soul Stone as part of their hunt for the Infinity Stones. When they encountered Warlock and he denied to give them the Soul Stone, he deployed his Knights of Xandar so the visitors would not just leave empty-handed, but they wouldn't leave at all. Eve Bakian tried to use the power of the four Infinity Stones they had collectet, but it was no match for Warlock, who used the Soul Stone to easily try to take over Eve's soul. Thanos caught Warlock off-guard, and knocked him out with an energy blast. The Mad Titan proceeded to beat Warlock to death, and steal the Soul Stone from him.