Avengers: Infinity War saw Thanos enact a brutal and precise plan to collect the Infinity Stones, destroying half the universe's population in the process. Avengers: Endgame dealt with the aftermath of Thanos' victory, but there's a lot the Mad Titan did wrong in that movie that led to his eventual defeat and the undoing of the snap.
We're starting with waiting. Thanos proves himself incredibly patient throughout the Marvel Cinematic Universe. One of the key parts of Thanos' plan is to avoid having his intentions made clears so as to be able to take on smaller forces and groups rather than a single, combined army. However, Endgame saw Thanos waiting for Nebula to retrieve the Infinity Gauntlet, which gave Earth's Mightiest Heroes time to regroup and eventually defeat him, though the victory saw some major losses.
Check out the video below for more colossal mistakes Thanos made in Endgame.
At this time, it seems unlikely Thanos will return any time soon. However, his brother -- Eros of Titan -- will likely play a role in the upcoming Eternals movie, so he'll almost certainly be mentioned in some capacity. Whether Josh Brolin actually reprises his role, though, remains to be seen.
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Directed by Joe and Anthony Russo, Avengers: Endgame stars Robert Downey Jr. as Iron Man, Chris Evans as Captain America, Mark Ruffalo as Bruce Banner, Chris Hemsworth as Thor, Scarlett Johansson as Black Widow, Jeremy Renner as Hawkeye, Brie Larson as Captain Marvel, Paul Rudd as Ant-Man, Don Cheadle as War Machine, Karen Gillan as Nebula, Danai Gurira as Okoye and Bradley Cooper as Rocket, with Gwyneth Paltrow Pepper Potts, Jon Favreau as Happy Hogan, Benedict Wong as Wong, Tessa Thompson as Valkyrie and Josh Brolin as Thanos. The film is in theaters now.