Doctor Doom's reign of terror is just beginning. Here's what to know about his role in the upcoming movie, 'Avengers: Doomsday,' including cast, release date and potential plot.

Robert Downey Jr will be introduced as Doctor Doom in Avengers: Doomsday – but what if he’s not the real Doom?

In Marvel Comics, Doom’s fixation on Franklin is legendary. He views the boy’s near-limitless powers as the key to creating and ruling Battleworld, a twisted reality of his own making as seen in Secret Wars.