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.

Doomsday. However, it is unclear which character the Marvel veteran will be playing. So, here's why he could be Steve Rogers' Captain America or a Marvel villain, instead of the rumored Johnny Storm.

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.