The first clip from Avengers: Endgame makes it clear that Captain Marvel is going to be integral to the titular team's plan to defeat Thanos and reverse the snap.
In the clip, which was released on Good Morning America, the Avengers make a plan to use the Infinity Stones again so as to reverse Thanos' snap. Bruce Banner expresses his doubts about being able to defeat the Mad Titan, especially considering the casualties suffered in Infinity War. Captain Marvel agrees that the team should fight Thanos and, when Banner asks why the battle would end differently than before, Captain Marvel retorts, "Because before you didn't have me."
Considering that Captain Marvel is one of the most powerful heroes in the Marvel Cinematic Universe, there was never any doubt that she was going to be integral to defeating Thanos. Her confidence definitely shows through, though it remains to be seen just how the Avengers' fight with the Mad Titan will go.
Directed by Anthony and Joe Russo, Avengers: Endgame stars Robert Downey Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, Jeremy Renner, Don Cheadle, Paul Rudd, Brie Larson, Karen Gillan, Danai Gurira, Benedict Wong, Jon Favreau and Bradley Cooper, with Gwyneth Paltrow and Josh Brolin. The film arrives April 26.