Doomsday? A cryptic post has fans buzzing, but his addition could create problems for Marvel. Find out what challenges a PG-13-rated Avengers movie could face with Deadpool in the mix.

Ryan Reynolds’ latest post on Instagram has cryptically hinted at Deadpool’s return in Avengers: Doomsday, with a red A graffiti over the Avengers logo.

For now, Marvel is believed to only be shooting scenes for Doomsday, with the timing of Reynolds' post strongly suggesting he's set to return for that, rather than later down the line. Indeed, some fans are eagerly anticipating a second big reveal of Avengers: Doomsday cast members, perhaps via a second set of chairs, as production continues.