If there is one movie that can be removed from the MCU entirely, it is The Incredible Hulk. Once a founding member of the universe, it has now been forgotten as a relic of a bygone era. It’s almost impossible to think of Edward Norton as Hulk, but once upon time, he was the unstoppable monster. However, the movie bore no connection to the first Avengers, much less Infinity War. It’s an easy decision to skip.
Iron Man burst on the scene in 2008 with a bang, jumpstarting the MCU. His role in Iron Man 2, however, did not meet the lofty standards set by its predecessor. That’s the main reason to skip this movie, but aside from introducing Black Widow (aka Natasha Romanoff), it also doesn’t play a role in the overarching Avengers storyline.
Thor is quite the divisive movie. Some hate it, others love it. I fall somewhere in between, but for me it’s still in the Don’t Watch category. At its core, it’s a simple origin story for Thor, although it does establish the existence of the Tesseract in the post-credit scenes.
Captain America: The First Avenger is technically the first MCU movie in terms of the chronological timeline, taking place during World War II. An Infinity Stone (the Tesseract) plays a major role in the plot of the movie, which is important for Infinity War, but that’s about the only thing you need to know about it. The rest is just a slow-churning plot where an idealist Captain America battles Hydra and the Red Skull.
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Article source: https://www.technobuffalo.com/2018/04/08/you-can-skip-these-mcu-movies-while-preparing-for-avengers-infinity-war/