Ryan Reynolds’ surprise appearance at San Diego Comic-Con in full Deadpool regalia has left fans questioning if the Merc with a Mouth is officially joining Avengers: Doomsday. While the actor’s banter with Robert Downey Jr. and the Russo brothers seemed like a classic meta-joke, the secretive nature of his arrival—and some pointed dialogue—has fueled speculation that a cameo might be in the cards.
The debate remains split between those who see the event as a deliberate tease for a future appearance and those who believe it was purely a standalone marketing stunt. With Avengers: Doomsday currently in production and heading for a December 2026 release, Marvel is keeping its cards close to the chest regarding any potential multiverse crossovers.