Thanos (who was briefly shown in Phase One and Phase Two) fills the role as the main antagonist of the third Phase. Nick Fury's origin is revealed and Loki has more of a neutral role in Phase Three. It starts off focusing on the division of the original Avengers (as shown before in the early Phases) with newly added superheroes like Bucky Barnes (first seen in Phase One and Phase Two), Scott Lang, T'Challa and Peter Parker being involved. Phase Three brings back every central character of both Phase One and Phase Two. This Phase also introduces the Guardians of the Galaxy ( Peter Quill, Gamora, Rocket, Groot and Drax), and Scott Lang. Phase Two centers on the MCU's first Avengers and Fury once again, along with new additions of the team ( James Rhodes, first seen in Phase One, Sam Wilson, Wanda Maximoff, and Vision). Another central character is Loki, a villain who originally caused the Avengers to form to thwart his plans of world domination. Phase One is centered on six individuals who become the Avengers ( Tony Stark, Steve Rogers, Thor Odinson, Bruce Banner, Natasha Romanoff, Clint Barton) along with Nick Fury, leader of S.H.I.E.L.D., who is responsible for the idea to set up the team. The first three phases are known as 'The Infinity Saga', and is followed by Phase Four.

The film and television series of the Marvel Cinematic Universe features many central characters across its phases.

(top, L to R) Chris Pratt, Zoe Saldana, Dave Bautista, (bottom, L to R) Vin Diesel, and Bradley Cooper, portray the first five Guardians of the Galaxy in the MCU and play a central role in the films.

3.5 Introduced in Marvel Television series.

2.93 John Walker / Captain America / U.S.

2.61 Peter Parker / Spider-Man / 'Peter-Three'.

2.60 Peter Parker / Spider-Man / 'Peter-Two'.

2.54 N'Jadaka / Erik 'Killmonger' Stevens.

2.9 Sharon Carter / Agent 13 / Power Broker.

1.35 Sam Wilson / Falcon / Captain America.1.2 Bucky Barnes / Winter Soldier / White Wolf.

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