At this point, it seems like every major actor in Hollywood has made at least one appearance in the Marvel Cinematic Universe, and it's hard to blame them considering just how successful those movies were, and how many careers those films either launched or rejuvenated.

That said, many of the original stars from the first Avengers and the movies that surrounded it, have now moved on to other things, after the events of Avengers: Endgame rendered many of them either dead or retired.

The door to the Marvel Cinematic Universe is never totally closed to those with enough commercial clout, however, and rumours are swirling about potential returns for actors who had seemingly drawn a line under their time as heroes (and villains).

The most obvious confirmed return is that of Robert Downey Jr.

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