Top 10 Avengers Doomsday Fan Theories
#10: Steve's Return Shows MCU's Fears
Following 11 years of MCU supremacy, 2019’s “Avengers: Endgame” was the finale in a long-running chapter. While the franchise continued into a new phase, the long story arc seemed less cohesive and more disjointed. Mixed in with general superhero fatigue, the pandemic, and the Johnathon Majors scandal, the MCU began struggling critically and at the box office. Some of the productions that struggled financially or didn’t break even include 2021’s “Black Widow” and 2023’s “The Marvels. When it was announced that Robert Downey Jr. was set to play Doctor Doom, speculation arose that the MCU was hitting the panic button to entice viewers back to the cinema. With Chris Evans’s return, there’s an idea that Marvel is even more worried.
#9: The Latverian Witches
If you were lucky enough to be at the 2026 San Diego Comic-Con, you may have seen some interesting things at the Marvel booth. Alongside some costumes from “Avengers: Doomsday” that we saw in the recent trailer, there were some that weren’t in it: the Doom-esque Latverian Witches. Over three days, the costume was replaced with different colors, green, purple, and orange, before Doom’s own one replaced the Witches. As such, folks are wondering about the identities of these new characters. Essentially, every female character has been suggested, either the OG version or a variant. Yet the most popular idea is that the Scarlet Witch might be one. Another interesting suggestion is that they're the missing X-Men characters, Storm, Rogue, and Jean Grey.
#8: Dead Space
Sometimes, the internet is a wonderful place. As soon as the recent “Doomsday” trailer dropped online, fans began dissecting every little scene for possible tidbits of information. Some eagle-eyed viewers saw that in a couple of scenes, there was dead space next to prominent characters. A similar situation has happened in earlier trailers and teasers. This gave rise to speculation that Marvel is either hiding potential plot spoilers from the trailer or that we can expect characters, either from older, non-MCU Marvel films or completely fresh introductions. It’s not unusual for Marvel to mislead slightly in their trailers, as they alluded to the Hulk being in the final battle of 2018’s “Avengers: Infinity War,” when he wasn’t.
#7: Tony the Anchor
Ever since “Endgame,” the MCU has heavily featured the multiverse. With “Doomsday,” the plot seemingly involves it unravelling. Well, as we found out in 2024’s “Deadpool & Wolverine,” there may be a good reason for it happening in the main MCU universe: the demise of its anchor being. According to the TVA’s Mr. Paradox, when an anchor kicks the bucket, that universe collapses. Fans have theorized that Tony Stark was the MCU’s anchor, kickstarting the multiverse problems after his sacrifice in “Endgame.” This was seemingly supported by MCU head Kevin Feige, who referenced killing his own anchor being during a 2025 interview. However, he didn’t go into detail about who it was, so it could be Vision, Black Widow, Gamora, or another death from “Endgame.”
#6: Franklin Richards is the Key
Marvel comic fans know just how powerful Franklin is. And if the fan theories have it right, he could be a major catalyst for Doom, either positive or negative. After all, in the post-credit scene with 2025’s “The Fantastic Four: First Steps,” we saw Doom interacting with Franklin. Some believe that when the toddler touched Viktor’s face, it healed his scar or changed his appearance to look like Tony. It’s then speculated that Doom, perhaps pretending to be a hero, used Franklin’s power to combat the incursions, essentially turning the young Richards into Doom’s Infinity Gauntlet. On the flip side, some fans believe Franklin will be the key to stopping Viktor, perhaps in 2027’s “Avengers: Secret Wars.”
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#5: Hydra Cap
Seven years after Steve Rogers went into the past and returned to the present day as Old Man Steve, “Doomsday” gave us the young version back. However, some can’t shake the feeling that something strange is happening. There’s a belief that this isn’t exactly Steve. Instead, it could be Hydra Cap, the version from the comic event “Secret Empire,” when Captain America’s history was changed to having always been a Hydra agent. After all, that version can lift Mjolnir, just like the trailer showed. There’s also speculation that it could be Loki in disguise, believing Thor wouldn’t trust him. And thanks to his work at the TVA, he’s worthy of Mjolnir. Other possible suggestions on Steve’s true identity include Mephisto, Mystique, and even Doom.
#4: Magical Doom
Not many Marvel beings can withstand a strike from Thor with Stormbreaker. Even Thanos fell victim to it. Yet in the “Doomsday” trailer, Doom blocked a powerful strike from Thor with only two fingers. Immediately, there was outrage from some devoted fans, who felt it was too OP. However, once again, eagle-eyed viewers noticed a design on Viktor’s gauntlet that resembles a magical rune. In the comics, while Doom is well-known for his science acumen, his magic proficiency is just as dangerous. After all, he's dabbled with the dark arts for years, and his mother was a user. So, we can probably expect Doom to employ runes, spells, and artefacts, and have a colorful light battle against Doctor Strange.
#3: Steve Broke Everything
At the end of “Endgame,” Steve departs back in time to return the Infinity Stones to their rightful place. And, in doing so, he gets to live his life with Peggy Carter. Cute. However, less cute is that it may have caused all the issues that led to “Doomsday.” After all, in “Endgame,” the Ancient One makes it clear that the timeline is fragile and can split. So, with Steve going back in time and likely changing things, no matter how small, like the Butterfly Effect, everything is different. One of the knock-on effects is believed to have led to the destruction of Doom’s family. With his world in tatters, either literally or metaphorically, Viktor goes on a dark crusade to correct Cap’s time-travelling.
#2: Friendly-Galaxy Spider-Man… & Friends
We’ve seen Spidey in space before, what’s one more? Heck, it was even in an “Avenger’s” film! While Tom Holland’s uber-popular webslinger is still suspiciously absent from Doomsday’s cast list, we have to believe he’ll be at least making a cameo. It’s Spider-Man! The post-credit scene of “Brand New Day” seems to point in that direction, with Ned’s Spidey-Tracker all-but confirming the webhead will be heading to outer space. Like, really far out there in outer space. He did just meet a certain psychic mutant, too, so who knows, maybe she’s tagging along? As we said earlier, Doom does like his witches. Either way, something tells us Doom will be meeting Peter Parker sooner rather than later.
#1: The Death of Two Big Hitters
Remember how cool it was for Tobey Maguire to reprise his Peter Parker in 2021’s “Spider-Man: No Way Home” and Hugh Jackman to be Logan again in 2024’s “Deadpool & Wolverine”? Well, if a leaked plot for “Doomsday” is to be believed, you’re going to be very sad. Apparently, in the film’s opening, Wade and Logan arrive on Maguire’s Earth to destroy it to save another and stop an incursion. However, the explosive requires Wolverine to remain behind to set it manually, causing his and Spider-Maguire’s demise. It’s alleged that in the “Doomsday” trailer, the planet Charles Xavier watches be destroyed is this Earth. With Jackman’s Wolverine’s death, this could be the opportunity to introduce a new actor to play a variant of Logan.
Do you have a crazy theory for “Avengers: Doomsday” that no one seems to be talking about? Let us know below!
