Marvel Studios Hall H Comic-Con panel gave fans a whole lot to be excited about, but by far the biggest moment of the night came when Iron Man star and Oscar winner Robert Downey Jr. was revealed to be returning to the MCU as Doctor Doom. Avengers: Endgame directing duo The Russo Brothers will also return to helm the fifth and sixth Avengers movies, now officially titled Avengers: Doomsday and Avengers: Secret Wars, with Downey Jr.