Avengers: DoomsdayUnofficial Fan Guide148d04h22m19s

Speculation only

Theories & Predictions

Everything here is rumor or reasoned guesswork - clearly separated from the confirmed information on the rest of the site.

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Nothing on this page is confirmed by Marvel. It's speculation, prediction, or unverified rumor, kept separate on purpose. See our Editorial Policy for how we define these categories.
A stack of comic books
Fan theories draw on decades of comics - but comics history isn't a confirmed plot.

Rumored Rumored

A possible Deadpool cameo

A Ryan Reynolds social-media post in August 2025 fueled speculation about a Deadpool appearance. Trade press covering it was explicit that no one - press included - could confirm it either way. As of this update, it remains unconfirmed.

Additional surprise cameos

Marvel executives and Robert Downey Jr. have teased that more cast members remain to be revealed beyond the official 30. That's a studio tease, not a leak - we'll move any name to the Cast & Characters guide the moment Marvel confirms it directly.

Editorial theory Theory

Who might not survive the film

Marvel hasn't indicated which, if any, major characters die. We raise it only because the two prior Avengers crossovers both killed major characters - this is pattern-based speculation, not a confident prediction.

What Doctor Doom is actually planning

Marvel's synopsis calls Doom only an “existential threat.” Everything beyond that is our own reasoning from his comics history and general directorial comments. See the Doctor Doom guide for the confirmed-vs-theory breakdown.

A possible trailer easter egg

Some fans noted unusual empty space/editing in one teaser and speculated it hid a spoiler. That's fan and press speculation about editing choices, not anything Marvel has acknowledged.

Why we keep this page separate

Mixing speculation into our confirmed guides would make it harder to trust either one. Keeping rumors and theories on their own clearly-labeled page - and labeled wherever else they appear - is a deliberate choice explained in our Editorial Policy.

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We label speculation clearly so the confirmed guides stay trustworthy.

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