Marvel Studios has officially begun production on the highly anticipated Avengers: Doomsday and the first set photo featuring Doctor Doom has fans buzzing with excitement.

With Avengers: 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, and the results has some fans worried.