The first official Avengers: Doomsday trailer has sent the Marvel Cinematic Universe (MCU) fandom into overdrive. Within 24 hours of its release, the trailer reportedly crossed 500 million views, making it one of Marvel Studios’ biggest trailer launches. But instead of answering questions, it has created even more mysteries surrounding Chris Evans’ Steve Rogers, the possible return of Captain America, and the surprising absence of Spider-Man.
From theories about Captain Hydra to speculation that Marvel is hiding Tom Holland’s Spider-Man, here’s everything fans are talking about after watching the Avengers: Doomsday trailer.
Chris Evans’ Return Has Fans Asking One Big Question
The biggest talking point from the trailer is the appearance of Steve Rogers, played by Chris Evans.
While many fans were excited to see the iconic Avenger return, others quickly noticed that something felt different. His appearance, expressions, and overall demeanor have sparked widespread speculation that this may not be the Steve Rogers fans remember from Avengers: Endgame.
Several viewers believe Marvel intentionally designed the trailer to make audiences question whether this version of Steve Rogers is truly Captain America.
Is This Captain America or Captain Hydra?
One of the most popular fan theories revolves around Captain Hydra, an alternate comic storyline where Steve Rogers is secretly aligned with Hydra.
Although Marvel Studios has not confirmed this storyline for Avengers: Doomsday, fans believe certain moments in the trailer hint that the returning Steve Rogers could be:
- A multiverse variant
- An impostor
- A clone
- Captain Hydra from another universe
With the MCU fully embracing the multiverse, many believe Marvel could introduce a darker version of Captain America to surprise audiences. At this stage, however, these remain fan theories rather than confirmed plot details.

Why Spider-Man Is Missing From the Trailer
Another major surprise is the complete absence of Spider-Man.
Despite months of speculation, Tom Holland’s Peter Parker does not appear in the trailer, and Marvel has not officially announced him as part of the confirmed cast.
This has led fans to question whether Spider-Man has been removed from the film or whether Marvel is simply saving his appearance for a bigger reveal.
Could Marvel Be Hiding Spider-Man?
Many Marvel fans believe the absence of Spider-Man is intentional.
Following the events of Spider-Man: No Way Home, Peter Parker is living in a world where nobody remembers his identity. Meanwhile, his upcoming solo film, Spider-Man: Brand New Day, is expected to continue that storyline before Avengers: Doomsday arrives.
Because of this timeline, several fans think Marvel is deliberately keeping Spider-Man out of promotional material to avoid revealing major spoilers.
Doctor Doom Takes Center Stage
While much of the conversation has focused on Steve Rogers, the trailer also gives fans a closer look at Doctor Doom, played by Robert Downey Jr.
The film positions Doctor Doom as the central villain of the next Avengers chapter, bringing together heroes from multiple universes, including the Avengers, Fantastic Four, and X-Men. The movie is expected to continue Marvel’s Multiverse Saga and lead directly into Avengers: Secret Wars.
What Marvel Has Confirmed So Far
Although fan theories continue to dominate social media, Marvel Studios has officially confirmed only a few details:
- Chris Evans returns as Steve Rogers.
- Robert Downey Jr. plays Doctor Doom.
- The film features characters from multiple Marvel universes.
- Avengers: Doomsday is scheduled to release on December 18, 2026.
Everything else—including Captain Hydra, evil Steve Rogers, and Spider-Man’s hidden role—remains speculation.
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