A trailer for Avengers: Doomsday has been released, and it appears to offer a first look at Robert Downey Jr. as Doctor Doom. The trailer is said to feature the character, but it is unclear whether Doctor Doom will be portrayed as a hero or villain in the film. The release of the trailer has generated discussion among fans, with some also noticing the appearance of other characters, such as H.E.R.B.I.E.