Thanos, basically the antagonist of the Avengers movie series, aims to curb down the overpopulation and save the planet. The big purple giant, which we know as the ‘Mad Titan’ or ‘Thanos,’ met his end in the ‘Endgame’. He died at the beginning of the movie, and with fifteen minutes, of the movie he died. But he succeeded in eliminating half of the population from the universe. The Mad Titan met his end from a blow from Thor but that was not at all the end of Thanos’ threat of destroying the universe. A version of the antagonist appeared from 2014, specifically during the events of the first “Guardians of the Galaxy” film.
Thanos is acting as a uniting factor for the heroes of the Marvel Cinematic Universe. Though, without a Thanos in this reality, Tony would continue living as Iron Man, never needing to sacrifice himself to save the world.
In able to bring stability in the universe, Thanos set about tracking down the Infinity Stones, as the combination of the stones might just wipe out half the population from the universe. Thanos also collectively forged alliances with Loki and Ronan the Accuser in order to track down some of the Stones. However, both of the alliances cost Thanos much of his resources. The loyalty of Gamora and Nebula his daughters, and the Mind Stone were the main among those sacrifices.
However, he faced off against the powerfully combined opposition avengers and the wrath of Thor, Thanos still is ultimately triumphed as he completed the Infinity Gauntlet, using it to finally complete his goal to combat population and had then caused the Snap, resulting in half of all life in the universe being wiped out at the snap from his fingers. However, he later time-traveled to 2023 to lay a siege on the Avengers!