Since 2012, we have seen the Avengers work together to save the world from being destroyed, even if it came at the cost of major damage to cities. Next year, the superhero team will be split up and facing off against one another in "Captain America: Civil War." What will happen when Captain America (Chris Evans) goes head-to-head with Iron Man (Robert Downey Jr.)?

Marvel has revealed the full synopsis for "Captain America: Civil War," which will mark the beginning of Phase 3. Steve Rogers/Captain America will continue to lead the Avengers, but the government now wants to be involved and hold the team accountable for their actions following more "collateral damage." This government body would then be able to direct the team, while also keeping them in check.

"The new status quo fractures the Avengers, resulting in two camps—one led by Steve Rogers and his desire for the Avengers to remain free to defend humanity without government interference, and the other following Tony Stark’s surprising decision to support government oversight and accountability," the synopsis teases.

Adding to the conflict between Captain America and Iron Man is their disagreement on Bucky Barnes/Winter Soldier (Sebastian Stan). Bucky was Captain America's friend growing up and he believes he's not the bad guy everyone thinks he is. The government sees the Winter Soldier as a threat and they don't plan on keeping him alive.

The first trailer for the movie previews this struggle, which will eventually put the two heroes against one another. At one point in the video, Captain America is shown saying "Sorry Tony, you know I wouldn't do this if I had any other choice, but he's my friend." Iron Man looks at Captain America with a surprise look on his face and replies, "So was I." Iron Man is then seen trying to fight off both Captain America and the Winter Soldier when the promo comes to an end.

Watch the full "Captain America: Civil War" trailer below:

Not only are Captain America and Iron Man squaring off, but this will force other superheroes to make a decision about what side they're on. Black Widow (Scarlett Johansson), Hawkeye (Jeremy Renner), Ant-Man (Paul Rudd), Falcon (Anthony Mackie) and War Machine (Don Cheadle) will all be joining the fight. Black Panther (Chadwick Boseman) and the new Spider-Man (Tom Holland) are also expected to debut in the film.

"Captain America: Civil War" will be the first film in Phase 3 of Marvel's movies. The film hits theaters May 6, 2016.