‘Avengers: Doomsday’ Trailer: Robert Downey Jr. Faces Off Against Mister Fantastic, X-Men and Avengers With Army of Sentinels

Marvel Studios unveiled the second “Avengers: Doomsday” trailer on Friday during Disney’s D23 fan convention, further teasing the massive MCU team-up movie arriving in theaters Dec. 18. The Avengers, Fantastic Four, Thunderbolts and more heroes are joining forces to take down Doctor Doom, the evil villain played by Robert Downey Jr. in his return to…