Marvel trailers have a long history of hiding secrets in plain sight. While many shots are designed to misdirect audiences, others have later turned out to be pivotal moments lifted directly from a film's climax. That history has led fans to dissect every frame of the Avengers: Doomsday trailer, searching for clues about where the MCU's next crossover event is headed. Now, one particular sequence has sparked a compelling theory that could reshape expectations for the film.

If fans are analyzing the trailer correctly, Marvel may have already teased one of Avengers: Doomsday's biggest twists, one that could pave the way for Avengers: Secret Wars.

One of the trailer's most emotional shots shows Johnny Storm embracing someone as Earth appears to collapse behind him. His devastated expression suggests complete hopelessness, and the moment bears a striking resemblance to the trailer's opening scene, where Professor X silently watches another world being destroyed through the Xavier School's window. Together, the scenes have fueled speculation that Marvel is depicting the destruction of multiple realities before the film's conclusion.

The theory becomes even more intriguing when viewed through the lens of Marvel Comics. Some fans believe Avengers: Doomsday could end with the deaths of nearly every major hero before Doctor Doom steals Loki's reality-shaping powers, creates Battleworld, and resurrects everyone without their memories. While some question why Marvel would reveal such a crucial moment in a trailer, the studio has done something similar before. The first Avengers: Infinity War trailer featured footage from scenes that ultimately appeared near the end of the film, proving that late-game moments are not always kept hidden.

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With theories about Battleworld continuing to gain momentum, Marvel also delivered another major surprise that has fans even more excited for the crossover event.

Ryan Reynolds officially confirmed at San Diego Comic-Con that Deadpool will appear in Avengers: Doomsday, sending Marvel fans into a frenzy. Staying completely in character, Reynolds took the stage wearing the gray Deadpool suit inspired by Rick Remender's Uncanny X-Force and filled the announcement with the trademark sarcasm that has become synonymous with Wade Wilson. He joked about masks, a "Canadian tuxedo," and turned what could have been a routine reveal into a memorable performance.

Marvel, however, stopped short of revealing exactly how Deadpool fits into the story. Neither the studio nor Reynolds shared any plot details, and reports suggest his role could range from a brief cameo to something far more significant. Some fans believe he will provide comic relief amid the multiversal chaos, while others think his reality-hopping abilities could make him an unpredictable wildcard as Doctor Doom's plans unfold and the X-Men become increasingly intertwined with the MCU's future.

Marvel has yet to confirm whether the trailer truly contains footage from Avengers: Doomsday's finale, but the parallels spotted by fans have certainly added another layer of intrigue. Whether the theory proves accurate or not, speculation surrounding Doctor Doom, Battleworld, and Secret Wars is only growing stronger as the film approaches.

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Do you think Marvel has already spoiled Avengers: Doomsday's ending, or is the trailer cleverly misleading fans? Let us know in the comments!