Captain America star Chris Evans has said he isn't returning to the Marvel Cinematic Universe in Avengers Doomsday or any other film, despite reports to the contrary. Evans told Esquire that a report from Deadline,

A recent report claimed former Captain America actor Chris Evans would return to the MCU in Avengers: Doomsday, but now the actor is denying he'll be back.

But exactly what the plot of that movie actually is is anybody's guess. We know that it will include the return of Robert Downey Jr., now playing Doctor Doom, but an intriguing theory suggests how a potentially returning Chris Evans and Captain America may factor in, and how it will actually all tie into Avengers: Endgame.