Thanos (Marvel Cinematic Universe)

Thanos is a fictional character portrayed primarily by Josh Brolin in the Marvel Cinematic Universe (MCU) media franchise, based on the Marvel Comics supervillain of the same name. He is depicted as an alien warlord from the doomed planet Titan with a universe-spanning agenda to wipe out half of all life to stabilize overpopulation and prevent what he views as life's inevitable extinction. To do this, he sets out to obtain the six Infinity Stones, cosmic gems with the power to achieve his goal. With the help of his adopted children, Thanos fights against the Avengers, the Guardians of the Galaxy, and their allies, in the Infinity War, succeeds in assembling the Stones, and disintegrates half of all life in the universe in an event that is known as the Decimation. After escaping to the Garden and destroying the Stones, he is found and confronted by the surviving Avengers, and promptly killed by Thor once he reveals that his act is irreversible. Five years later, an alternate version of Thanos from 2014 time travels to 2023 to battle the Avengers once again, but is killed by Tony Stark. Thanos is a key figure in the 23 films that make up the MCU's Infinity Saga, having appeared in five of its films, most notably as the main antagonist of both Avengers: Infinity War (2018) and Avengers: Endgame (2019). Several versions of Thanos from alternate realities in the MCU multiverse also appear in Endgame, the Disney+ animated television series What If...? (2021–2024) and Marvel Zombies (2025), and the Phase Four film Doctor Strange in the Multiverse of Madness (2022). Thanos' appearance changed drastically over the course of his appearances as advances in CGI and motion capture technology allowed for better capture of Brolin's facial features. A new facial capture application called Masquerade was created for Infinity War and Endgame using machine learning. The character has been praised by critics and fans alike, with Brolin winning multiple awards for his performance. Thanos is often credited as one of the MCU's best villains, as well as one of the greatest film villains of all time. After his appearance in Infinity War, he became a key figure in popular culture and memes, making appearances in a variety of other media.

Fictional character biography Thanos' story in the MCU takes place in the Earth-616 universe. The fictional biography below includes events that happened to Thanos from more than one Earth-616 timeline, as well as events that happened to him from multiple other universes.

Early life Thanos was born approximately 1,000 years ago on the planet Titan to A'Lars, along with his brother Eros. Thanos deems the growth of Titan's population to be unsustainable, so he proposes to arbitrarily kill half of Titan's population. However, his people reject the idea and Thanos is subsequently ostracized. Over time, Thanos' prediction comes to pass, with him and Eros being the only surviving members.

Balancing the universe Thanos, driven by his belief that the universe must be balanced by eliminating half of its population, embarks on conquests involving the killing of half of the planets' populations, becoming feared and powerful while taking control of various armies. He forges alliances with the Other and Ronan the Accuser, and adopts orphan children from worlds he invades, including Gamora and Nebula, considering the former to be his favorite. Eventually, he decides to obtain the Infinity Stones after realizing he could use them to wipe out half of all life in the universe. He obtains the Mind Stone and places it in a scepter. In 2012, Thanos directs the Other to form an alliance with Loki. Thanos provides Loki with the scepter and a Chitauri army to obtain the Space Stone within the Tesseract by conquering Earth. Following Loki's defeat by the Avengers and the loss of the Mind Stone, the Other reports the failed attack to Thanos. In 2014, Thanos locates the Power Stone and sends Ronan, Gamora, and Nebula to retrieve it. However, they betray him: Gamora joins the Guardians of the Galaxy, Ronan obtains the Power Stone and resolves to kill Thanos after destroying Xandar, while Nebula allies with Ronan. The Guardians of the Galaxy defeat Ronan and leave the Power Stone with the Nova Corps. In 2015, Thanos arrives on Nidavellir and forces the native Dwarves to forge the Infinity Gauntlet to hold all six Stones, planning to collect them himself.

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