MCU fans have taken to X/Twitter to put forward a theory about the Marvel star's return, as well as explaining why it's a bad idea.

All good things must come to an end, unless it’s the Marvel Cinematic Universe. Then, you just throw the actor into the multiverse, and out comes a new beginning. In an unsurprising surprise move by Marvel,

So it remains unclear if Evans, who starred as Captain America Steve Rogers and made brief appearances as that character in several MCU films, will reprise that role or take on a new one in "Avengers: Doomsday," due in theaters in May 2026.