MCU villains are often seen as the weak link in many of the films, but the fact that Robert Downey Jr. was even cast is a clear indication that plans for Doctor Doom or something else. Doom is one of the the most popular Marvel villains ever, and with a major star playing the role, expectations are that the plans for Doom are quite significant.

Robert Downey Jr. has shared a new behind-the-scenes photo from the set of Avengers: Doomsday – and eagle-eyed fans have spotted a detail that might reveal something about his Doctor Doom costume.

Robert Downey Jr. just released an image of himself on Instagram seemingly to help promote a friend's endeavor as well as to tease fans with his upcoming role in "Avengers: Doomsday". The image shows Downey flexing and showing off some muscles, while reading fellow Marvel star Jeremy Renner's memoir, "My Next Breath". You can see the image below.