The supposed sighting comes roughly 11 seconds into the trailer, as Captain America (Chris Evans), Black Widow (Scarlett Johansson), and a wounded Vision (Paul Bettany) walk into what is believed to be a Wakandan facility.
YOU CANT TELL ME THATS NOT HER pic.twitter.com/2yDgQlYd7d— em (@spideyrogrs) February 5, 2018
Fans took to social media to share their findings, posting loops and comparison photos:
if you look behind steve in the trailer you can see someone walking behind him and the suit looks exactly like captain marvel pic.twitter.com/UPTrebftfS— em (@spideyrogrs) February 5, 2018
Me seeing Captain Marvel in the background of the new Infinity War trailer pic.twitter.com/GOIhJOETza— Daniel (@ftdanieljames) February 5, 2018
YEAH NO THAT LOOKS LIKE CAPTAIN MARVEL BUT I STILL HEAVILY DOUBT ITS HER— deadasspool (@KIDLUCIFER666) February 5, 2018
If Captain Marvel shows up in Infinity War, at any capacity, I will lose my mind.— Chloe Marie (@CleoChlo) February 5, 2018
Look below Cap's left hand and you can see a trenchcoat — the same coat sported by Olsen in leaked screenshots from November.
Olsen is seen wearing the coat in the official trailer, so it's just Olsen's hair that is being mistaken for Captain Marvel's insignia.
Larson's Air Force pilot-turned-superhero isn't in Infinity War, co-director Joe Russo told ComicBook.com in July.
While the Russo brothers and Marvel Studios are known for keeping secrets, Larson isn't expected to make her Marvel Cinematic Universe debut until Captain Marvel flies into theaters in March 2019. She'll then take part in Avengers 4, out May 2019.
Fans got their first look at Larson suited up as the cosmic superhero late last month, as set photos revealed the actress sporting a green and black Kree-inspired battle suit.
Avengers: Infinity War opens May 4.