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.

Based on how First Steps ends, Doomsday will probably open with Doctor Doom kidnapping young Franklin Richards and making a beeline for Earth-616, forcing Reed and his family to pursue. Reed and Vanessa Kirby’s Sue will be desperate to reunite with their son, forming what will surely be one of the key emotional throughlines of the film.

Sue Storm actor Vanessa Kirby says Robert Downey, Jr. is doing "amazing work" as Doctor Doom and as the behind-the-scenes leader of the cast