Recent speculation regarding the Marvel Cinematic Universe (MCU) has proposed a compelling theory surrounding the potential backstory for Robert Downey Jr.’s portrayal of Victor Von Doom in Avengers: Doomsday. This theory intriguingly ties back to an iconic narrative from 20th Century Fox’s X-Men series. Downey Jr.’s comeback as Doctor Doom in 2024’s much-anticipated titles, including Avengers: Doomsday and Secret Wars, has ignited discussions, particularly given his previous role as Tony Stark, a.k.a. Iron Man. The suggestion that his version of Doctor Doom hails from an alternate reality has fueled various origination theories.
During a recent livestream—an event that unveiled the initial 27 confirmed cast members for Avengers: Doomsday—Robert Downey Jr. emphasized his pivotal role in the MCU’s Phase 6. This event highlighted that Doctor Doom will not only face off against the Avengers and the Thunderbolts, but also the Fantastic Four and a selection of X-Men drawn from Fox’s long-standing franchise. The introduction of these familiar faces may provide a unique lens through which Doctor Doom’s backstory can be reimagined, potentially altering the MCU landscape.
The Return of Fox’s Classic X-Men
Revisiting the Classic X-Men Team Since 2014





The classic X-Men, first introduced in 2000’s X-Men, have been mostly absent since 2014. However, many iconic characters are confirmed to reprise their roles in Avengers: Doomsday. Key figures such as Patrick Stewart’s Professor X and Ian McKellen’s Magneto are returning, alongside surprising reintegrations of actors like James Marsden, Rebecca Romijn, Alan Cumming, Kelsey Grammer, and Channing Tatum. This revival is poised to excite both long-time fans and newcomers to the MCU.
Returning X-Men Character | Actor | Debut Project | Last Seen |
---|---|---|---|
Hank McCoy’s Beast | Kelsey Grammer | X-Men: The Last Stand (2006) | The Marvels (2023) |
Charles Xavier’s Professor X | Patrick Stewart | X-Men (2000) | Doctor Strange in the Multiverse of Madness (2022) |
Erik Lehnsherr’s Magneto | Ian McKellen | X-Men (2000) | X-Men: Days of Future Past (2014) |
Kurt Wagner’s Nightcrawler | Alan Cumming | X2: X-Men United (2003) | X2: X-Men United (2003) |
Raven Darkhölme’s Mystique | Rebecca Romijn | X-Men (2000) | X-Men: First Class (2011) |
Scott Summers’ Cyclops | James Marsden | X-Men (2000) | X-Men: Days of Future Past (2014) |
Remy LeBeau’s Gambit | Channing Tatum | Deadpool & Wolverine (2024) | Deadpool & Wolverine (2024) |
While several original X-Men members remain unconfirmed for a return, there are expectations for notable figures like Halle Berry, Famke Janssen, Shawn Ashmore, and even Hugh Jackman and Ryan Reynolds, who have recently entered the MCU in 2024’s Deadpool & Wolverine. Additionally, new theories speculate on how Doctor Doom’s character arc may intertwine with the mutant superhero team.
Tony Stark’s Warning About Time Manipulation
Tony Stark and Time Travel: A Revelation in Avengers: Endgame

In Avengers: Endgame, the pivotal moment when Scott Lang emerges from the Quantum Realm propels the Avengers into undertaking the Time Heist, aiming to retrieve the Infinity Stones from past events to avert the calamities following Thanos’s actions in Infinity War. While this venture was initiated by Lang, it was Tony Stark’s intellect that uncovered the essential principles behind safe time travel, albeit with a cautionary note: “when you mess with time, it tends to mess back.” This intriguing yet unexplained line could potentially provide insight into Downey Jr.’s renewed role within the MCU.
https://www.youtube.com/watch?v=GrVw_yvkfbo
https://www.youtube.com/watch?v=GrVw_yvkfbo
Prior to Avengers: Endgame, Tony Stark had no awareness of time travel’s complexities. However, a captivating theory suggests that Stark’s caution may relate to events in X-Men: Days of Future Past, where the film introduced time travel concepts through Kitty Pryde’s abilities, showcasing Wolverine’s consciousness sent back to 1973 to alter critical events. This connection hints that Stark’s remarks might be referencing those significant alterations within the X-Men narrative.
Doctor Doom’s Origins in the Changed X-Men Timeline: The Theory Unveiled
Victor Von Doom: A Creation of the X-Men’s Temporal Interventions

A recent theory circulating on Instagram postulates that Robert Downey Jr.’s Doctor Doom may have arisen from the timeline alterations manifested in Fox’s X-Men: Days of Future Past. In the 2014 film, pivotal timelines were merged and altered, notably by Wolverine’s return to 1973, resulting in historical shifts that transformed various antagonists, including Mystique and Magneto, into heroic figures. Such major changes would likely draw the attention of significant multiversal denizens.
The Time Variance Authority (TVA) displayed indifference toward Earth-10005 in both their perception of its degrading state in Deadpool & Wolverine, yet with its salvation, this narrative may shift. This concept implies that Doctor Doom, a character not originally conceived in Fox’s timeline, is instead a consequence of Wolverine’s temporal tampering, drastically reshaping Robert Downey Jr.’s characterization from hero to a formidable villain.
Implications of Doctor Doom’s Connection to the X-Men in the MCU
Doctor Doom’s Legacy as the Archenemy of the Fantastic Four

While traditionally known as the principal antagonist for Marvel’s Fantastic Four, Doctor Doom has prolonged feuds with numerous heroes across the Marvel landscape since his introduction in 1962’s The Fantastic Four #5, which also includes notable clashes with the X-Men. Hence, a connection between Doctor Doom and the mutant superheroes in Avengers: Doomsday is both conceivable and logical.
Setting his origins within Earth-10005 would facilitate an easy exit strategy for this iteration of Victor Von Doom following Doomsday and Secret Wars. This narrative trajectory might also foreshadow similar developments for the X-Men characters, establishing a compelling thrum of interconnected stories that could shape the MCU’s future.