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

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.