Doomsday now filming and the film's release date only a year away, fans can't stop theorising about what's in store for the next Avengers reunion. One particular Reddit user has done the maths on which Avengers: Endgame characters are returning,

Whether the "mystery actor" is a name already known or one that hasn't yet surfaced, the photo revealed by MCU Film News sent fans into a wild run of speculation. The guesses about who the character/actor was began running rampant,

What we know about Avengers: Doomsday has been limited, but the blockbuster is definitely coming together behind the scenes. Marvel's live stream revealed most of its cast, which obviously includes Robert Downey Jr.'s return and debut as Doctor Doom. A photo from The Russos' Instagram showed that they're seemingly on set, check it out below: