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15 Avengers: Doomsday Fan Theories That Could Turn Out to Be True

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These could actually be happening...

Ivan Shahran

Entertainment - September 9th 2026, 15:30 GMT+2

Doctor Doom Avengers Doomsday — 15. Doctor Doom Is an Iron Man Variant

Robert Downey Jr.'s casting has inevitably led to theories that his **Victor von Doom could somehow be connected to Tony Stark**. The most straightforward possibility is that Doom comes from another universe where Tony Stark followed a very different path. This theory has gained momentum recently after David Harbour, who plays Red Guardian, was asked if he could recite a line from *Avengers: Doomsday* in an interview. He answered by saying, **"You … are Tony Stark."** | © Disney Studios Motion Pictures / Marvel Studios

Steve Rogers Avengers Doomsday — 14. Steve Rogers Will Be Central to the Story

Chris Evans' return has generated enormous speculation, especially because Marvel has not revealed exactly how Steve Rogers fits into the story. **Some rumors suggest his character could have a much more important role** than a simple cameo, with many believing Rogers' decision to stay in the past with Peggy may have had a negative impact on Doctor Doom. Others have suggested that Rogers will return as Nomad, an alternate identity that, according to the comics, Steve Rogers adopts after he abandons the Captain America title. | © Disney Studios Motion Pictures / Marvel Studios

13. Deadpool and Wolverine Could Appear in the Opening

Following the massive success of *Deadpool & Wolverine*, fans have naturally expected Ryan Reynolds and Hugh Jackman to return. Some alleged leaks claim the pair could appear very early in *Doomsday*. This theory sounds like a long shot, but Ryan Reynolds' surprise appearance during Marvel's presentation at Comic-Con earlier this year has given fans a lot of hope about its possibility. | © Disney Studios Motion Pictures / Marvel Studios

Tobey Maguire Spider Man — 12. Tobey Maguire's Spider-Man Will Appear

Few rumors have generated more excitement than the possibility of Tobey Maguire returning. **Some alleged plot leaks claim his Spider-Man universe could actually be involved in the movie's opening**, although Maguire has not been officially confirmed to be a part of *Avengers: Doomsday*. Still, given that Maguire returned as Spider-Man in *Spider-Man: No Way Home*, he could very well reprise the role once again. | © Marvel Enterprises / Sony Pictures Releasing

Destroyed Universe Avengers Doomsday — 11. One Entire Universe Will Be Destroyed

A rather bleak theory suggests that *Avengers: Doomsday* could demonstrate the irreversible consequences of an incursion by **destroying one of the universes entirely.** This would immediately establish that the multiverse is no longer something Marvel heroes can simply repair. | © Disney Studios Motion Pictures / Marvel Studios

Doom Avengers Doomsday — 10. Doom Is Trying to Save the Multiverse

Doctor Doom may be the villain, but some theories suggest **his motivations could be more complicated**. Some suspect that he could genuinely believe that destroying or controlling certain universes is the only way to prevent the entire multiverse from collapsing. | © Disney Studios Motion Pictures / Marvel Studios

Avengers in Avengers Doomsday — 9. The Avengers Will Be Forced to Work With Doom

A fascinating possibility is that the **Avengers could temporarily need Doom's help.** If the multiverse is collapsing, even the Avengers might have no choice but to cooperate with their enemy before eventually turning against him. | © Disney Studios Motion Pictures / Marvel Studios

Loki Avengers Doomsday — 8. Loki Will Have a Huge Role

Even though Loki has never fully been considered a member of the Avengers, he has undergone some serious character development in the *Loki* TV series that could see him play a major role in *Avengers: Doomsday.* His connection to the multiverse makes him an obvious candidate for a movie that brings together heroes from three different universes. One theory suggests Loki's powers could ultimately be essential to whatever happens to Doctor Doom and reality. | © Disney Studios Motion Pictures / Marvel Studios

Thor Avengers Doomsday — 7. Thor Could Die

Some circulating theories claim that Thor could die in *Avengers: Doomsday*. The trailers have stressed that Doctor Doom is more powerful than any threat the Avengers have previously faced, and that he is invincible to attacks from Stormbreaker. So, Thor's death (or any other Avenger's death, for that matter) would certainly be a possibility. If anything, this happening would instantly raise the stakes heading into *Secret Wars*. | © Disney Studios Motion Pictures / Marvel Studios

X Men Avengers Doomsday — 6. The X-Men Will Be From a Dying Universe

Rather than simply dropping the X-Men into the MCU, **one theory suggests their universe could already be on the verge of destruction**. That would give the mutants a much stronger reason to be involved in *Avengers: Doomsday* in the first place. This theory is likely true, considering that the X-Mansion is shown to be in tatters in the movie trailers. | © Disney Studios Motion Pictures / Marvel Studios

Scarlet Witch Avengers Doomsday — 5. Scarlet Witch Could Return

Elizabeth Olsen's Scarlet Witch remains one of the MCU's most popular characters. Recent speculation has suggested that Wanda could appear in some capacity in *Avengers: Doomsday.* This is largely because one of the Latverian Witches revealed at San Diego Comic-Con wore a familiar red hue. Olsen has previously stated that she would be "happy" to return as the Scarlet Witch, should an opportunity to "use her well" present itself. | © Disney Studios Motion Pictures / Marvel Studios

Avengers Losing Avengers Doomsday — 4. The Avengers Will Lose

Rather than giving audiences another conventional superhero victory, **Marvel could end *Avengers: Doomsday* with the heroes completely defeated**. That would leave *Secret Wars* to become the ultimate comeback story. Fans are a little divided on this theory, considering this exact outcome took place in *Avengers: Infinity War*. The heroes eventually defeated Thanos in *Avengers: Endgame*. So, having the Avengers be defeated in *Doomsday* to only come back and defeat Doctor Doom in *Secret Wars* would be repetitive. | © Disney Studios Motion Pictures / Marvel Studios

Battleworld Avengers Doomsday — 3. The Movie Will End With Battleworld

Given *Doomsday*'s connection to the *Secret Wars* comic, many fans suspect the movie could end with **Doom creating some version of Battleworld**, a patchwork planet formed from fragments of destroyed universes and realities. This would provide a direct bridge into the next *Avengers* movie and explain why so many different Marvel universes are being brought together. | © Disney Studios Motion Pictures / Marvel Studios

Soft Reboot Avengers Doomsday — 2. The Movie Will Set Up a Soft Reboot of the MCU

One of the biggest suspicions surrounding *Avengers: Doomsday* and *Avengers: Secret Wars* is that **Marvel could use the multiverse storyline to effectively reset parts of the MCU.** The potential destruction of one or more universes would allow the studio to retain popular characters while simplifying a continuity that has become rather complicated over the years. | © Disney Studios Motion Pictures / Marvel Studios

Franklin Richards Avengers Doomsday — 1. Franklin Richards Could Be Crucial to the Multiverse

Franklin Richards is one of Marvel Comics' most powerful characters, as he possesses reality-altering abilities that could make him incredibly valuable in *Avengers: Doomsday*. *The Fantastic Four: First Steps* already gave us a hint at how important Franklin could be to the MCU, with Galactus becoming obsessed with the child. More credence has been given to this theory after it was announced that Noah Jupe was cast in an unknown role in *Avengers: Secret Wars*. | © Disney Studios Motion Pictures / Marvel Studios

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Avengers: Doomsday is shaping up to be one of Marvel's biggest movies yet, as it will bring together characters from across the MCU. With the movie still some time away and various trailers having been released, many rumors and fan theories have emerged. We've put together 15 of them that have a real chance of happening. None of the following rumors should be treated as confirmed, but some have decent weight behind them.

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Avengers: Doomsday is shaping up to be one of Marvel's biggest movies yet, as it will bring together characters from across the MCU. With the movie still some time away and various trailers having been released, many rumors and fan theories have emerged. We've put together 15 of them that have a real chance of happening. None of the following rumors should be treated as confirmed, but some have decent weight behind them.