A fascinating
MCU theory points out that Robert Downey Jr.'s casting as Doctor Doom is likely going to change a key Thanos line from Avengers: Infinity War. Following the Mad Titan as he finally collects all the Infinity Stones, Infinity War includes Thanos' battle to claim the Time Stone which features an epic sequence where he goes head-to-head with Downey Jr.'s Iron Man. This results in one of the Mad Titan's most poignant lines, one that will most likely take on a whole new meaning in Avengers 5.
As was announced at San Diego Comic-Con 2024, Robert Downey Jr. has been cast as the MCU's Doctor Doom, and will serve as the big bad in Avengers: Doomsday. He'll likely be the big bad in Avengers: Secret Wars as well.
Keeping that in mind, one of Thanos' best Infinity War lines to Iron Man will likely take on a whole new meaning now that Downey will be playing Doctor Doom in the MCU.
Robert Downey Jr's Return As Doctor Doom Changes Thanos's "I Hope They Remember You" Line The Avengers May Have To Reconcile Doom With The Iron Man They Once Knew Close While battling Iron Man, Spider-Man, Doctor Strange, and a number of the Guardians of the Galaxy on Titan, there are a few sequences where the Mad Titan gets to fight Iron Man directly.
Not only does Thanos confirm that he's long been aware of who Tony Stark is, but he also shares his respect for Iron Man despite Stark's efforts to prevent his erasure of half of life in the universe. As such, this interaction also provides one of Thanos' best lines:
"When I'm done, half of humanity will still be alive. I hope they remember you."
While the line is powerful, it hits even harder following Avengers: Endgame after Iron Man gives his life using the Infinity Gauntlet to defeat Thanos and his forces. However, the argument can be made that the line may soon take on a whole new kind of meaning in light of Robert Downey Jr.'s Doctor Doom casting.
After all, one can imagine that several of the Avengers will likely have a hard time reconciling the new villain they'll soon encounter with the hero they remember, especially if he has the same face.
Why RDJ's Return As Doctor Doom Will Change Iron Man's Legacy Whether He's A Variant Or Not New Mask, Same Task (And Same Face)
Ultimately, it doesn't matter if Robert Downey Jr. is playing a genuine Victor von Doom in the MCU's future or some sort of Tony Stark variant who became Doom instead of Iron Man.
The legacy of Iron Man will be affected either way. By casting the same actor, Marvel Studios is inviting new ways of looking at Iron Man's legacy as a hero. Hopefully, this is why Marvel cast Robert Downey Jr. in the first place, having an intentional reason for casting the same actor for one of the biggest supervillains of all time.
Avengers 5 Not Yet Rated AdventureSuperheroAction Avengers: Doomsday is the fifth Avengers film in the Marvel Cinematic Universe and will bring together heroes, new and old, to face off against Victor von Doom - played by the returning Robert DOwney Jr.. Avengers 5 will also mark the beginning of phase 6 of the MCU.
Director Destin Daniel Cretton
Release Date May 1, 2026
Studio(s) Marvel Studios
Distributor(s) Walt Disney Studios Motion Pictures
Writers Michael Waldron
Cast Kathryn Newton , Iman Vellani , Mark Ruffalo , Hailee Steinfield , Anthony Mackie , Benedict Wong , Simu Liu , Benedict Cumberbatch , Dominique Thorne , Xochitl Gomez , Chris Hemsworth , Brie Larson
Franchise(s) The Avengers
prequel(s) The Amazing Spider-Man , Shang-Chi 2 , Captain America , Captain Marvel , Daredevil , Ant-Man and the Wasp
Budget $356–400 million Expand Upcoming MCU Movies
Captain America: Brave New World
Release Date February 14, 2025
Thunderbolts*
Release Date May 2, 2025
The Fantastic Four (2025)
Release Date July 25, 2025
Blade (2025)
Release Date November 7, 2025
Avengers: Doomsday
Release Date May 1, 2026
Avengers: Secret Wars
Release Date May 7, 2027
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