Thanos was the main villain of the Infinity Saga, and while his plan and intentions were clear, a fan theory suggests Thanos was literally mad, all due to an illness introduced in Eternals, which completely changes his arc in Avengers: Infinity War. For over a decade, the Marvel Cinematic Universe has brought a variety of characters from Marvel Comics to the big screen – from heroes to villains and allies, from Earth and from other planets and realms. The first three Phases of the MCU, collectively known as the Infinity Saga, introduced the heroes that would lead this first part of MCU history, and they all came together to defeat Thanos (Josh Brolin) in Avengers: Endgame.
Thanos made his MCU debut in the post-credits scene of The Avengers, and after that, the MCU slowly built his introduction as the main villain not only of the Avengers team but the MCU in general, as he had links to other characters, particularly the Guardians of the Galaxy. Thanos was on a quest from his very first appearance: acquire all the Infinity Stones, mount them on the Infinity Gauntlet, and with the power of the Stones, wipe out half of life in the universe with just the snap of his fingers. Although the Avengers, New Avengers, Guardians of the Galaxy, and more joined forces in different places (and planets) to stop Thanos’ armies and the Mad Titan himself from doing the nap, Thanos eventually fulfilled his plans.
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The reasons behind Thanos’ decision to get rid of half of life in the universe and through that bring “balance” to it were rooted in his traumatic past on his home planet Titan, and since his defeat in Avengers: Endgame, in which all those who vanished
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