From Kang to Doomsday: Unpacking the MCU’s Phase 6 Revolution
Marvel shocks fans by firing Jonathan Majors and replacing Kang with Robert Downey Jr.’s Doctor Doom in Avengers: Doomsday. MCU Phase 6 reimagined!
Published: October 1, 2025, 8:05 am
The MCU underwent one of its biggest back-end shakeups in recent memory, with massive ramifications for not only the direction of Phase 6 but the entire Multiverse Saga. What started as a grand design revolving around Kang the Conqueror has shifted into an entirely different story, with Doctor Doom emerging as the main Villain.
Jonathan Majors and the Fall of Kang
The change began with dire legal problems for Jonathan Majors, who was set to be the MCU’s next big villain after Thanos. In March 2023, Majors was taken into custody on charges of assault and harassment against his ex-girlfriend Grace Jabbari. The matter intensified when in December 2023 he was convicted by a New York jury of reckless assault and second-degree harassment, The Guardians stated.
Marvel Studios’ Toughest Decision Yet
Marvel Studios fired Jonathan Majors just hours after his conviction to be charged with assault and harassment in his ex-girlfriend’s case associated their charges Jonathan Majors was facing a similar hammer blow to his career as the next MCU big bad villain after Thanos. The actor had already played multiple Kang variants in Loki seasons 1 and 2, and Ant-Man and the Wasp: Quantumania. His termination presented a monumental storytelling issue for Marvel, as Kang was supposed to be the overarching menace throughout Phases 4, 5 and 6.
A New Overarching Villain Emerges
The consequences of Majors’ termination were much more than the removal of a single actor. Marvel entirely dropped the Kang-centric plotline which had been developing since 2021. The fifth Avengers movie, Avengers: The Kang Dynasty, was renamed Avengers: Doomsday. This was a radical departure from multiversal villainy centered on Kang to dealing with a more “realistic” but just as threatening antagonist.
From The Kang Dynasty to Avengers: Doomsday
Marvel had originally centered the entire Multiverse Saga on Kang after being impressed with Majors’ turn as He Who Remains in Loki. The time-traveling, reality-altering villain’s age made him a perfect choice for a story that would take place across multiple timelines and dimensions. However, it has been reported that Marvel Studios had reservations about Kang and the Multiverse Saga even prior to Majors’ legal troubles, suggesting there were some doubts internally as to the direction.
Robert Downey Jr. Returns as Doctor Doom
In one of the most surprising MCU news of all time, Robert Downey Jr. was confirmed to be returning to the franchise as Victor von Doom/Doctor Doom at San Diego Comic-Con 2024. Downey’s dramatic unmasking of himself onstage during the announcement sent shockwaves through the entertainment industry.
The casting decision is a “daring creative pivot” as the former Iron Man actor now embodies one of Marvel’s most iconic villains. Iron Man 3 director Shane Black predicts this casting will “singlehandedly reignite the entire comic book movie industry”. Black said, “I think he’s going to singlehandedly reinvigorate the entire comic book movie industry with that. At first, it seemed like a cynical move, you know, like “Oh, let’s just go back to the well of the one guy that seems to always save us.” But it’s going to be. It’s going to be great.
The Ripple Effect: Industry and Fan Responses
The entertainment industry has been cautiously optimistic about these seismic shifts. Marvel waited until Majors was convicted to fire him, an act of restraint compared to the industry norm of immediately dismissing actors on the basis of accusations as shared.
A number of MCU alumni have voiced their enthusiasm at Downey’s return, although many were surprised by the news. Jeremy Renner disclosed that he had “no idea” about the casting, and that Downey “said nothing” to his MCU colleagues. Tom Hiddleston described the casting as “remarkable” and “absolutely extraordinary”.
Some fans have complained about the casting, fearful of Doom being given a revised origin that includes Tony Stark.Still, the bar is set extremely high, with a lot of people seeing this as Marvel’s shot at recapturing the magic of the Infinity Saga.
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Phase 6 Takes a Drastic New Turn
Doctor Doom will be the main villain of Avengers: Doomsday (2026) and Avengers: Secret Wars (2027). The Russo Brothers, who helmed Infinity War and Endgame, are back to direct both movies. This is a massive deviation from the original Kang-centric narrative, however there are rumors that Marvel might still find a way to finish off the story for Kang via a potential recast.
The changes are not just about swapping out the villain. Marvel is slashing its content output drastically`, with as few as two films a year, rather than up to four in recent years shared by Screenrant. The change is part of a larger Disney strategy to prioritize quality over quantity after some mixed feelings about recent MCU offerings.
A Defining Moment for Marvel’s Future
The Phase 6 overhaul is arguably the most significant plot twist the MCU has ever seen. What was meant to be a multiverse story focused on Kang has now become something else entirely, with Doctor Doom seemingly going to end the Multiverse Saga. Early reviews from the cast are that Downey’s performance as Doom is outstanding, with Vanessa Kirby calling it “some of the most amazing work I’ve seen” in. The success of this recalibration will ultimately dictate the MCU’s future path. With Marvel now proceeding with Avengers: Doomsday in December 2026, the entertainment world wonders if the breathtaking turn of events behind the scenes is going to lead to a resurgence of creativity or become a cautionary tale about the perils of planning franchise far ahead in a volatile world.
Final Thoughts
The Marvel Phase 6 storyline changes entirely and gives everyone a big shock with its new plot. The decision of changing the biggest villain of the Multiverse Saga is tough for Russo Brother but they came back with a surprise casting after Jonathan Majors got fired, Robert Downey Jr. is returned as a villain in Avengers next film Avengers: Doomsday. Marvel entirely dropped the Kang-centric plotline that was supposed to be the overarching menace throughout Phases 4, 5 and 6 and adopt renamed it with Doomsday.
