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.'s Doctor Doom comes to life in the MCU as new Avengers: Doomsday art sees him defeating the Avengers, X-Men, and Fantastic Four.

While I won’t be sharing any spoilers for the latest MCU tale here, what isn’t a spoiler is that it was officially announced last month that many of Thunderbolts*’s starring characters will be back for next year’s Avengers: Doomsday.