The first teaser for Avengers: Doomsday has leaked online — and it contains a massive spoiler about the new Marvel movie

• The first details about Avengers: Doomsday's various trailers have leaked online
• One teaser has already been shared widely across the internet
• Marvel is battling to keep the footage under wraps

Christmas has come early for Marvel fans after the first details about multiple trailers for Avengers: Doomsday leaked online.

Last weekend (December 13/14), rumors were rife that the comic book giant would release four (!) teasers for its much-anticipated superhero movie. Those emerged in the wake of speculation that Marvel would only release a single Doomsday trailer before the end of 2025, that it would run ahead of public screenings of Avatar: Fire and Ash, and that the Avengers 5 trailer's runtime had reportedly been revealed.

Now, fresh details have emerged about those teasers. According to news outlet Feature First, each preview will be shown before Avatar 3 for one week only over the next four weeks. So ...