This summer, Marvel will kick off its Phase Three lineup with a bang when Captain America: Civil War hits theaters on May 6. This highly-anticipated superhero adventure splits the Marvel Cinematic Universe in two, with Team Captain America squaring off against Team Iron Man. Earlier today, the IMAX Twitter feed released a new poster, while asking fans to choose their side by using the hashtags #TeamCap or #TeamIronMan.

Marvel's Captain America: Civil War finds Steve Rogers leading the newly formed team of Avengers in their continued efforts to safeguard humanity. But after another incident involving the Avengers results in collateral damage, political pressure mounts to install a system of accountability, headed by a governing body to oversee and direct the team. 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.

Team Iron Man includes Tony Stark (Robert Downey Jr.), Black Widow (Scarlett Johansson), Vision (Paul Bettany), War Machine (Don Cheadle) and the new character T'challa (Chadwick Boseman), who will make his debut in this movie before starring in Black Panther, set for release on February 16, 2018. Team Cap includes Captain America (Chris Evans), The Falcon (Anthony Mackie), Scarlet Witch (Elizabeth Olsen), Hawkeye (Jeremy Renner), Ant-Man (Paul Rudd) and The Winter Soldier (Sebastian Stan). Marvel's Captain America: Civil War also stars Frank Grillo as Crossbones, William Hurt as Thaddeus Ross, Daniel Brühl as the villainous Baron Zemo and Tom Holland as Spider-Man.

Anthony Russo & Joe Russo are directing with Kevin Feige producing. Louis D'Esposito, Alan Fine, Victoria Alonso, Patricia Whitcher, Nate Moore and Stan Lee are the executive producers. The screenplay is by Christopher Markus & Stephen McFeely. Get ready to pick a side and join the nonstop action playing out on two fronts when Marvel's Captain America: Civil War opens in U.S. theaters on May 6, 2016.

Phase Three of the Marvel Cinematic Universe will continue later this year with Doctor Strange (November 4, 2016). Other movies set for Phase Three include Guardians of the Galaxy Vol. 2 (May 5, 2017), Spider-Man (July 7, 2017), Thor: Ragnarok (November 3, 2017), Black Panther (February 16, 2018), Avengers: Infinity War Part I(May 4, 2018), Ant-Man and the Wasp (July 6, 2018), Captain Marvel (March 8, 2019), Avengers: Infinity War - Part II (May 3, 2019) and Inhumans (July 12, 2019). Take a look at the new poster from Captain America: Civil War below, and choose your side on social media with the #TeamCap and #TeamIronMan hashtags.