Disney(NEW YORK) — Fans have been flipping out thanks to Marvel Studios’ Wednesday reveal of the first trailer to Avengers: Infinity War. One of those is star Sebastian Stan.

“It looks insane!” he enthused to ABC Radio, just after the trailer debuted, before adding with a laugh, “I’m just so happy I’m in the movie!”

Stan’s been part of the Marvel Cinematic Universe since he first played Captain America/Steve Rogers’ childhood pal James Buchanan “Bucky” Barnes in 2011’s Captain America: The First Avenger.  Audiences saw him reborn as the brainwashed, metal-armed assassin known as the Winter Soldier in the 2014 sequel Captain America: The Winter Soldier and 2016’s Captain America: Civil War.  

The stars who have appeared in all those movies — some 83 actors in all — recently gathered for a “class picture published in Vanity Fair magazine.

“It was crazy because…I can’t even recall a moment in time when all these people have been in the same room,” Stan says of the shoot. “I mean you’re talking about Evangeline Lilly, to Paul Rudd, to Samuel L. Jackson, to Robert Downey Jr. to William Hurt, to Vin Diesel to — It just was nuts.”

Infinity War, which hits theaters in May of 2018, and 2019’s Avengers 4, could mark the final Avengers adventures for some of Marvel Studios’ heavy hitters, like Chris Evans’ Captain America and Downey’s Iron Man.

“It does feel like it’s coming to an end,” Stan says wistfully. “And it’s really sad at different, times, and weird…It’s been a part of my life, but a part of people’s lives for 10 years.”

Marvel Studios is owned by Disney, parent company of ABC News.