With the launch of “Avengers: Age of Ultron” just around the corner, Marvel Studios is already looking ahead to what will come next. As the Marvel Cinematic Universe (MCU) revs up its Phase 3, factions in the coming fight among the superheroes are beginning to form.

There have been countless reports as to what the future may hold for the various heroes who make up “The Avengers.” However, most of them have been based on rumor until now. Friday, the official plot synopsis for Marvel’s 2016 film “Captain America: Civil War” was released.

According to /Film, the plot synopsis reads: “Following the events of Age of Ultron, the collective governments of the world pass an act designed to regulate all superhuman activity. This polarizes opinion amongst the Avengers, causing two factions to side with Iron Man or Captain America, which causes an epic battle between former allies.”

None of this information is necessarily new, given that the “Civil War” plotline is a major and controversial event in Marvel’s pre-existing comic-book world. However, it does confirm that the studio will indeed need to draw on its pre-established characters in the MCU to make the large-scale war come to fruition.

According to CinemaBlend, the heroes who will join Captain America’s (Chris Evans) team to fight against registration will be Black Widow (Scarlett Johansson), Falcon (Anthony Mackie), Scarlet Witch (Elizabeth Olsen), The Vision (Paul Bettany) and War Machine (Don Cheadle). The Captain’s team may consist of only three low-level Avengers, but the secondary hitters Falcon and War Machine are no slouches. In fact, War Machine even beat up the pro-registration leader Iron Man (Robert Downey Jr.) in “Iron Man 2.”

If the composition of this lineup is accurate, it would mean one of two things: Either the remaining Avengers -- Hawkeye (Jeremy Renner), Hulk (Mark Ruffalo), Quicksilver (Aaron Taylor Johnson) and Thor (Chris Hemsworth) -- will be on Iron Man’s side or those heroes will be conspicuously absent in the movie. Well, it’s been confirmed Renner will be in the movie, meaning he’d probably be on Tony Stark’s team. And Ruffalo has four more films in his contract, so seeing him show up would make sense. In contrast, Thor has his own stand-alone movie, “Thor: Ragnarok,” coming in July of the following year. So Hemsworth might not have time to appear in “Civil War.” As for Quicksilver, he hasn’t technically been introduced yet, but speculation about his character doesn’t look good thus far. A new report by Superhero News claimed the character will die in “Age of Ultron.”

It’s worth mentioning that nothing in terms of casting is set in stone for the film. In addition, Stark’s team could be without any Avengers. The movie will introduce heavy hitters such as Black Panther (Chadwick Boseman) and Spider-Man, although the latter has yet to be confirmed. Sebastian Stan will reprise his role as Bucky Barnes/The Winter Soldier as well, but his faction of choice is still a mystery. Perhaps these newer heroes will be all the firepower that Stark and the government need to stop the rogue Captain from leading his anti-registration freedom fighters.

Fans will have a better idea of which heroes remain in play when “Avengers: Age of Ultron” hits theaters May 1.

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