After some delays, 2021 has seen the Marvel Cinematic Universe Phase 4 fully swing into action as it already begins to set up long-term villains that will likely last into the MCU's Phase 5. Although Avengers: Endgame and the ending of The Infinity Saga set a high bar for everything that has to come after it, the MCU has already shown that they can rise to the challenge with several Disney+ TV shows and three big blockbusters released the MCU's Phase 4.
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