The star-studded cast consists of the following:
Chris Evans as Steve Rogers/Captain America
Robert Downey Jr. as Tony Stark/Iron Man
Scarlett Johansson as Natasha Romanoff/Black Widow
Sebastian Stan as Bucky Barnes/Winter Soldier
Anthony Mackie as Sam Wilson/Falcon
Paul Bettany as The Vision
Jeremy Renner as Clint Barton/Hawkeye
Don Cheadle as Jim Rhodes/War Machine
Elizabeth Olsen as Wanda Maximoff/Scarlet Witch
Paul Rudd as Scott Lang/Ant-Man
Emily VanCamp as Sharon Carter/Agent 13
Frank Grillo as Brock Rumlow/Crossbones
The following characters are new additions, except one:
That one is William Hurt as he reprises his role from 2008’s The Incredible Hulk as General Thaddeus ‘Thunderbolt’ Ross.
One new character is Chadwick Boseman known for playing famous baseball star Jackie Robinson in 42 and James Brown in Get on Up. He will be playing T’Challa/Black Panther.
Daniel Brühl who was in Inglorious Bastards will be playing Baron Helmut Zemo the super villain that faces off against Captain America in the iconic comic book series.
Last notable addition, Martin Freeman known as of late for playing Bilbo Baggins in the recent Hobbit Series. He is rumored to enter the Marvel Universe as Everett K. Ross who supported Klaw in Wakanda information making him a foe of T’Challa/Black Panther. So only time will tell what will happen between these two in Civil War.
It is safe to say this is one of the largest casts ever put together on the big screen, and only one-year after Avengers 2. Only time will tell in the coming months what each character will look like, well the new ones at least. Hopefully, if you haven’t seen it already, this will urge you to see Avengers 2 and maybe even re-watch the past Marvels movies in chronological order.
(taken from: http://therealstanlee.com/the-cast-for-captain-america-civil-war-has-been-announced---it-is-impressive?utm_content=buffer0f7b5&utm_medium=social&utm_source=facebook.com&utm_campaign=buffer)