“Ghostbusters: Afterlife” counts both Paul Rudd (“Ant-Man”) and Carrie Coon (“Avengers: Infinity War”) in its cast (IMDb), bringing the total number of Marvel Cinematic Universe stars in the film to two: Scott Lang, better known as the size-changing hero Ant-Man (Rudd), and Thanos’s henchwoman Proxima Midnight, voiced in both “Infinity War” and “Avengers: Endgame” by Coon.
That’s as of this writing, of course, since it’s completely possible and maybe even likely that one or two the film’s young stars, like Mckenna Grace or Finn Wolfhard, might find themselves cast in some Marvel project in the future, especially if the MCU continues expanding at the same rate it has been recently.
In fact, it’s even been reported that Wolfhard has joined the MCU, albeit in an unspecified and unconfirmed capacity. Giant Freakin Robot had an exclusive in May of 2022 that Wolfhard had signed onto a Marvel project, possibly in the role of a Loki variant in the upcoming second season of “Loki.” Wolfhard himself once joked to ComicBook.com about his desire to play a “Guy on Computer” type background role in some Marvel movie or television show.
All that is to say that even though “Ghostbusters: Afterlife” presently boasts two MCU vets, that number may someday soon become three.