Iron Man was the leader of the Marvel Cinematic Universe through the Infinity Saga, and in each appearance, he not only learned from past mistakes but he also made some improvements to his suits that made him more and more powerful, yet there were some inner struggles that kept him from seizing his full power in multiple occasions. The MCU began its journey in 2008 with Jon Favreau’s Iron Man, which set the tone for the rest of this connected universe and introduced Robert Downey Jr. as Tony Stark, who in the post-credits scene was approached by Nick Fury to join the Avenger Initiative.
Iron Man went on to lead the original Avengers team alongside Steve Rogers/Captain America (Chris Evans) and was the first MCU character to get three solo movies, a tradition that has now been broken by Thor, who got a fourth solo adventure in Thor: Love and Thunder. Tony Stark went through a whole journey in which he constantly struggled with the concept of a hero, what the world expected from him, his father’s legacy, and building his own path in the world, and he’s one of few MCU heroes who has no superpowers, so he relied on his genius intellect, combat skills, and advanced technology.
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In total, Iron Man appeared in eight MCU movies (without counting cameo appearances) and his story came to an end in Avengers: Endgame, when he sacrificed himself to save the universe by taking the Infinity Stones from Thanos, mounting them on his suit’s glove, and snapping Thanos and his armies away. As Tony learned from past mistakes and kept working on his suits and new technology, he became more and more powerful and his role in the MCU become more important, but how
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