Phase One is centered on six individuals who become the Avengers—Tony Stark, Steve Rogers, Thor, Bruce Banner, Natasha Romanoff, and Clint Barton.
agent; and Loki, Thor's adopted brother whose plans to achieve world domination prompt Fury to assemble the Avengers.
It begins with a civil war between the Avengers caused by the ideological differences between Rogers and Stark; they are joined by Bucky Barnes (introduced in Phase One), Lang, T'Challa, and Peter Parker.
Phase Four deals with the fallout of the Infinity Saga on the lives of the remaining Avengers, while introducing new heroes such as Yelena Belova, Shang-Chi, Marc Spector and Steven Grant, Kamala Khan, Jennifer Walters, Jack Russell, and the Eternals (including Sersi and Ikaris).
Romanoff's backstory and Parker facing the consequences of his superhero secret identity being publicly revealed are explored, Maximoff learns to unlock her full power as the Scarlet Witch which eventually leads her into conflict with Strange, Wilson grapples with the difficulties of becoming the next Captain America, Barton passes the mantle of Hawkeye on to a young protégé named Kate Bishop, Jane Foster (introduced in Phase One) becomes the Mighty Thor, Sharon Carter (introduced in Phase Two) is revealed to have become the villainous Power Broker, and Shuri becomes the new Black Panther after T'Challa's sudden passing.
A 2012 version of Loki (introduced in Phase Three) is arrested by the Time Variance Authority (TVA) and begins his own journey, exploring the concept of the multiverse, which is also overseen by the Watcher.
IGN opined, "With heroes ranging from super-spies to super-soldiers to space raccoons, the MCU has gifted us with some of the most memorable champions in movie history.