<P> Development of Civil War began in late 2013 when Markus and McFeely began writing the screenplay, which borrows concepts from the 2006 comic book storyline "Civil War", while also focusing on story and character elements from the previous Captain America films to conclude the trilogy . Following positive reactions to test screenings of The Winter Soldier, the Russo brothers were brought back to direct in early 2014 . The film's title and premise were revealed in October 2014, along with Downey's casting; additional cast members joined in the following months . Principal photography began in April 2015 at Pinewood Atlanta Studios in Fayette County, Georgia, and continued in the Metro Atlanta area before concluding in Germany in August 2015, with the film being the first to use IMAX's digital 2D cameras (for the film's central airport fight sequence). Visual effects were provided by nearly 20 different studios during the post-production process . </P> <P> Captain America: Civil War held its world premiere in Los Angeles on April 12, 2016, and was released in the United States on May 6, 2016, in 3D and IMAX 3D . The film was a critical and commercial success, grossing over $1.1 billion worldwide, and garnering praise for the performances (particularly Evans and Downey), action, screenplay, and themes . It became the highest - grossing film of 2016 and the twelfth - highest - grossing film of all time . </P> <P> In 1991, the brainwashed super-soldier James "Bucky" Barnes is dispatched from a Hydra base in Siberia to intercept an automobile carrying a case of super-soldier serum . In the present day, approximately one year after Ultron's defeat in the nation of Sokovia at the hands of the Avengers, Steve Rogers, Natasha Romanoff, Sam Wilson, and Wanda Maximoff stop Brock Rumlow from stealing a biological weapon from a lab in Lagos . Rumlow blows himself up, attempting to kill Rogers . Maximoff telekinetically contains the explosion and throws it upward, damaging a nearby building and killing several Wakandan humanitarian workers . </P> <P> U.S. Secretary of State Thaddeus Ross informs the Avengers that the United Nations (UN) is preparing to pass the Sokovia Accords, which will establish a UN panel to oversee and control the team . The Avengers are divided: Tony Stark supports oversight because of his role in Ultron's creation and Sokovia's devastation, while Rogers has more faith in his own judgment than that of a government . Meanwhile, Helmut Zemo tracks down and kills Barnes' old Hydra handler, stealing a book containing the trigger words that activate Barnes' brainwashing . At a conference in Vienna where the Accords are to be ratified, a bomb kills King T'Chaka of Wakanda . Security footage indicates the bomber is Barnes, whom T'Chaka's son, T'Challa, vows to kill . Informed by Sharon Carter of Barnes' whereabouts and the authorities' intentions to kill him, Rogers decides to try to bring in Barnes--his childhood friend and war comrade--himself . Rogers and Wilson track Barnes to Bucharest and attempt to protect him from T'Challa and the authorities, but all four, including T'Challa, are apprehended . </P>

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