Even before the controversial return of Robert Downey Jr to the MCU, Marvel made a habit of bringing characters back in strange and unexpected ways.

Robert Downey Jr. was vital to the birth of the Marvel Cinematic Universe on the big screen. His casting as Tony Stark, aka Iron Man, proved pivotal in helping to turn the MCU into the defining cinematic entity of the last 15 years.

It's unclear what the future holds for the Guardians of the Galaxy, but one star would love to return in Avengers: Doomsday and / or Secret Wars.