Marvel fans have spent the last year throwing thousands of theories at the wall. Most of them sound like pure fan fiction. Others are built on actual comic storylines, casting decisions, and clues Marvel itself keeps dropping. With Avengers: Doomsday now positioned as the centerpiece of the Multiverse Saga, some theories are starting to look less like internet speculation and more like educated predictions.
The biggest reason fans are taking these rumors seriously is simple: Marvel has already confirmed things that seemed impossible a few years ago. Robert Downey Jr. returning as Doctor Doom, the return of legacy X-Men actors, the Fantastic Four crossing into the larger MCU, and the Russo Brothers directing again all suggest Marvel is building toward something far larger than a traditional Avengers movie.
Doctor Doom Is Not A Tony Stark Variant
One of the earliest theories claimed that Robert Downey Jr.’s Doom would simply be an evil Tony Stark from another universe. That theory has slowly lost credibility. Marvel has repeatedly referred to Downey’s character specifically as Victor Von Doom rather than Tony Stark. Several reports and industry sources have pointed toward Marvel treating him as a completely separate character.
From a comic perspective, this makes more sense. Victor Von Doom is arguably Marvel’s greatest villain because he is not simply an evil version of a hero. He is a ruler, scientist, sorcerer, strategist, and political leader whose ego rivals even Reed Richards. Reducing him to “evil Iron Man” would undermine decades of comic history.
The more believable theory is that Marvel cast Downey because audiences already associate him with the MCU’s foundation. Watching the face that once saved the universe become its greatest threat creates an emotional shortcut Marvel doesn’t need years to build.
Doomsday May Adapt Parts Of Secret Wars Before Secret Wars
Marvel officially confirmed that Avengers: Secret Wars follows Doomsday. That has created a major theory among comic readers that Doomsday may actually adapt some of Jonathan Hickman’s Secret Wars storyline before the Secret Wars movie itself.
In the comics, Doctor Doom becomes the central figure after multiversal incursions begin destroying realities. He manipulates events from the shadows, eventually reshaping existence itself into Battleworld. Marvel has already confirmed multiple universes colliding inside Doomsday, including the Avengers, Fantastic Four, and X-Men worlds.
The realistic prediction is that Doomsday becomes Marvel’s version of “Infinity War” while Secret Wars becomes the “Endgame” equivalent. Doom likely wins the first round, as confirmed by Anthony Mackie that Doomsday will end in cliffhanger.
That structure also explains why the Russo Brothers keep describing the movie as a major reinvention of the MCU rather than another crossover event.
The X-Men And Avengers Could Initially Fight Each Other
This rumor has existed for months, and unlike many leaks, it actually fits comic history. Marvel has already confirmed the presence of major X-Men characters alongside Avengers teams and the Fantastic Four. The comic relationship between Avengers and mutants has always been complicated. Distrust, political conflict, and ideological differences have fueled multiple storylines. If universes are colliding because of incursions, the first assumption from both sides may be that the other group caused the crisis.
Several production rumors have referenced large-scale battles involving mutant locations and major team confrontations. While those leaks remain unconfirmed, the overall concept aligns strongly with comic history. The likely outcome is a temporary Avengers-versus-X-Men conflict before Doctor Doom emerges as the true threat.
Reed Richards Could Become Doom’s Biggest Rival
Many people expect Sam Wilson, Thor, or Doctor Strange to lead the fight against Doom. Comic readers know Reed Richards is usually the character most deeply connected to Victor Von Doom. Marvel’s decision to heavily integrate the Fantastic Four before Doomsday makes this theory increasingly believable.
Doom and Reed have one of the greatest rivalries in comic book history. It isn’t just about power. It is about intellect, ego, pride, and competing visions for humanity’s future. If Marvel wants audiences to understand why Doom is dangerous beyond his strength, Reed Richards may become the film’s emotional and intellectual counterweight.
Thor May Have The Largest Hero Role
One detail that has quietly appeared in industry reporting is Marvel reportedly positioning Thor as one of the movie’s biggest protagonists. Some reports even suggest he could function as a secondary lead behind Doctor Doom.
This theory makes sense for several reasons.Thor is now one of the few remaining original Avengers still active. He has cosmic experience, emotional history with universe-ending threats, and enough narrative weight to anchor a massive crossover.
Recent footage descriptions and promotional material have also focused heavily on Thor’s relationship with Love, suggesting Marvel may be setting up a more personal story amidst the multiversal chaos.
Doctor Doom Could Win
This is probably the theory with the strongest comic evidence. Marvel still has Secret Wars arriving one year later. That makes it difficult to imagine Doomsday ending with a clean Avengers victory.
The comic version of Secret Wars only works because Doom reaches a near-godlike position first. The heroes spend much of the story dealing with the consequences of his success. If Marvel follows even part of that blueprint, audiences should prepare for a darker ending than many expect.
The title itself feels like a warning rather than a promise of victory.
The most believable Avengers: Doomsday theories are the ones that require the least stretching. Doctor Doom leading a multiversal collapse, Reed Richards becoming his primary rival, Avengers and X-Men clashing before uniting, Thor carrying a major emotional role, and Doom potentially winning all fit both Marvel’s current direction and decades of comic storytelling.
Sujal Singh and Nikev Maze are the founders and editors of Cinemazze, where they lead the platform’s editorial vision and content strategy. With a deep interest in the entertainment industry, they focus on delivering timely coverage of movies, television series, streaming releases, celebrity news, trailers, and major industry developments. Their editorial approach combines accurate reporting with audience-focused storytelling, helping readers stay informed about the latest trends shaping modern entertainment. Through Cinemazze, they aim to build a trusted destination for entertainment enthusiasts by publishing well-researched articles, insightful analysis, and up-to-date news sourced from official announcements, verified interviews, studio releases, and other credible public sources. Their commitment to quality, transparency, and reader value remains at the core of Cinemazze’s mission as it continues to grow within the digital entertainment media landscape.
