Marvel Reportedly Planning a Game-Changing Spider-Man Moment for Avengers: Doomsday Opening Day

Tom Holland might not be on the Avengers: Doomsday call sheet (at least on paper), but Marvel keeps doing things that make it hard to believe Spider-Man sits this one out. The latest: a new report says Marvel is cutting a special Doomsday trailer to run with Spider-Man: Brand New Day in 2026. That is a very specific bit of synergy for a character who supposedly isn’t in the movie.

So why do people think Spidey factors into Doomsday?

• Industry watcher Daniel Richtman says Marvel is building a fresh Avengers: Doomsday trailer specifically to attach to Spider-Man: Brand New Day in 2026. Making a bespoke trailer just for that pairing suggests Marvel wants fans connecting those two movies.
• Collider previously noted that the first Doomsday trailer is already expected to premiere with Avatar: Fire and Ash on December 19, 2025. If that’s the case, creating another trailer months later just to play with Brand New Day is… pointed.
• Another insider claim floating around: if Holland shows up in Doomsday, think Avengers: Infinity War energy — not tons of screen time, but a meaningful swing when it counts.
• There was also that production overlap: Spider-Man: Brand New Day and Avengers: Doomsday reportedly filmed at Pinewood Studios in the UK at the same time. Same lot, same window. Convenient.
• The calendar lines up neatly: Brand New Day is slated for July 31, 2026 in the U.S., and Avengers: Doomsday is set for December 18, 2026. Drop a new Doomsday trailer with Spidey’s movie in July and keep the hype train rolling through the fall. Marvel loves a runway.

Why Spider-Man actually matters to a Phase 6 finale

No Way Home didn’t just crack the Multiverse door — it kicked it open, then rebuilt Peter Parker’s entire life via magic. He’s one of the few heroes who has literally lived through a reality rewrite in the MCU. If Marvel is steering toward a big multiversal reset, a street-level character who’s already navigated the repercussions — and happens to be smart enough to understand some of the science — is kind of perfect.

There’s also the emotional side. The chatter says Robert Downey Jr. is back, but this time as Doctor Doom. If that pans out, you don’t have to stretch too far to imagine what that does to Peter, who still carries the weight of Tony Stark. That’s rich drama baked into the spectacle.

And long-term, Holland’s Spidey is young enough to survive a Phase 6 blowout and roll into whatever comes next, including the inevitable heavy push for mutants. Comics have a long history of Spider-Man mixing it up with the X-Men — plenty of ways to keep the character relevant without repeating himself.

Where Doomsday stands right now (as far as anyone will say)

The working picture being passed around: Avengers: Doomsday is being steered by the Russo Brothers, with a cast that includes Robert Downey Jr., Chris Hemsworth, Pedro Pascal, and Anthony Mackie. The date you should have circled is December 18, 2026. To be clear, a lot of this is still being whispered rather than loudly confirmed, but that’s the current shape of things.

The bottom line

If Marvel really is tailoring a Doomsday trailer to debut with Brand New Day, that’s not random marketing — that’s a wink. I wouldn’t expect Spider-Man to dominate the next Avengers movie, but a sharp, well-timed appearance that ties the multiverse threads together? That tracks.