Just because Avengers: Infinity War has pulled together every major character in the Marvel universe in one movie, it doesn't mean that the as-yet-untitled Avengers 4 can't draft in a few surprise guests of its own.
Case in point: remember Harley Keener?
Only, as that film was released in 2013, Simpkins is now 16 years old and looking a little more like this:
BOND! James Bond... or not pic.twitter.com/hURxSFF5Y1- TY SIMPKINS (@TYSIMPKINSactor) September 10, 2017
How Harley will fit into the film remains to be seen, and will probably depend on where we leave Iron Man at the end of Infinity War too.
But with a recent casting call for the movie hinting that a major character could be killed off, fans are already speculating that Harley could return as part of a funeral for Tony Stark (Robert Downey Jr) before taking on the Iron Man mantle for himself.
Of course, Marvel hasn't confirmed the casting yet and it's unlikely we'll get any firm details for a while yet – after all, we still have Thor: Ragnarok, Ant-Man and the Wasp and the flashback movie Captain Marvel to get through before we can even think about what comes after Infinity War.
Avengers 4 will be directed by Anthony and Joe Russo and is set to be a turning point in the Marvel Cinematic Universe as it closes off Marvel's third phase of films and sets up Phase Four.
Avengers 4 will be released in the UK on April 26, 2019, and in the US on May 3, 2019.
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