The long-term future of the Marvel Cinematic Universe is shrouded in mystery, which is something of a rarity considering the comic book giant usually has a dozen sequels lined up on its roadmap.
Infinity War will mark the beginning of the end for Phase 3 and the untitled fourth Avengers movie will bring the curtain down on it, paving the way for who knows what.
Marvel Studios head honcho Kevin Feige has previously offered vague comments about what follows, stating that it won't necessarily be Phase 4, but something different. Exactly what that will be is something Avengers 4 must set up.
The only confirmed Marvel films beyond the fourth Avengers are Guardians of the Galaxy 3 and a sequel to Spider-Man: Homecoming, and this leaves so many unanswered questions about the studio's film slate going forward.
Is it done with Captain America, Thor and Iron Man sequels? Does that mean those characters are going to die, or will they find roles for them in the background? Will Black Widow ever get a solo outing, and is Marvel going to be focusing on standalone movies from 2019?
That's a lot of burning questions for Avengers 4 to address, but hopefully the answers will begin trickling in with Infinity War next year.