Fans are somewhat critical of Marvel Cinematic Universe's Phase 4 and the way it's being handled so far, but it is actually setting up more of a universe than Phases 1 through 3 ever did. During Phase 1 (which includes everything up to the first Avengers movie) Nick Fury was the glue of the Marvel universe. At the end of the first Iron Man, Nick Fury breaks into Tony Stark's home after he announces that he is Iron Man at a press conference. He is waiting for Tony and asks him about something called the «Avengers initiative,» which inspired every fan who saw that moment to wonder, excitedly, what's coming next. Phase 1 was focused on building up the Avengers and also setting up Thanos as the universe's main villain.
Taking place after the Battle of New York, Phase 2 introduced the Guardians of the Galaxy, Ant-Man and The Wasp, Falcon, Scarlet Witch, Vision, and a short-lived Quicksilver. This Phase of the Marvel universe was colored by more ground-level action when it wasn't focusing on an infinity stone, but the infinity stones still permeated through the Phase 2 films. Thor: The Dark World featured a plot revolving around the Aether, or the «reality» stone, and Guardians of the Galaxy had a story featuring the power stone. The world-building was done mainly in those two movies, with the rest of the Phase being more self-contained when it came to infinity stones. Phase 3, which includes Captain America: Civil War through Spider-Man: Far From Home, has a lot more world-building through infinity stones than its prior Phases. Doctor Strange and Captain Marvel used the stones as a center point for their plots, culminating in Infinity War and Endgame.
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