The casting of Robert Downey Jr. as Doctor Doom has turned more than a few heads, but some fans are convinced it’s a red herring.

The casting of the former Iron Man star, whose death was the exclamation mark that ended the legendary Infinity Saga, hassent fans into a tizzy.

Many fans are digging deep to try to find any excuse as to how the RDJ casting is not what it is at face value, and assuming that the goal is for some kind of massive twist. One Twitter user is convinced it’s all to hide the casting of another fan-favorite pick as the real Doom.

My friend thinks Robert Downey Jr as Doctor Doom for Avengers: Doomsday is just a cover up for another actor to be revealed during the movie…Cillian Murphy? 👀#SDCC#Avengerspic.twitter.com/9k1gV4622p

“My friend thinks Robert Downey Jr as Doctor Doom for Avengers: Doomsday is just a cover up for another actor to be revealed during the movie…Cillian Murphy?” user BLUERAYANGEL shared in aposton X.

The twist would be massive but not unprecedented for the MCU. Downey himself was in the first major MCU casting twist whenBen Kingsley’s Mandarinwas revealed to be a fake in Iron Man 3.

As forCillian Murphy, he’s managed to avoid superhero fare since appearing as Scarecrow in Christopher Nolan’sDark Knight Trilogy. The Irish actor, now best known for his role alongside Downey in Oppenheimer, has long been a fan-favorite pick to play the sinister Dr. Doom, a scheming dictator who aspires for cosmic power.

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While you wait to find out if RDJ will be the Doom or he was just another trick to keep fans on the edge of their seats, check out ourDeadpool 3 ending explaineror find all theEaster eggs in the moviewith us.

You can also read about Deadpool & Wolverine’sjaw-dropping box officeand look ahead toupcoming Marvel movieslikeAvengers Doomsday.

Christopher Baggett was a TV & Movies Writer on Dexerto’s US team and a comics expert, across DC Comics and Marvel. He also has bylines at ComicsBeat, Comic Book Resources, and The HomeWorld.