Actress Emily VanCamp will return as Sharon Carter in the third instalment of "Captain America".
VanCamp's plot in the film remains under wraps, reported Deadline.
VanCamp, 28, previously appeared briefly in the second movie, "Captain America: The Winter Soldier", as Captain's (Chris Evans) neighbour, Kate.
In the comics, Sharon is Peggy Carter's niece. In the first instalment, "Captain America: The First Avenger", Peggy is Captain America's love interest. She later gets her own TV series "Marvel's Agent Carter" on ABC.
The famous Marvel superhero Iron Man (Robert Downey Jr) will appear in the film as an antagonist character.
Other superheroes who will join Tony Stark in the upcoming movie are Black Widow (Scarlett Johansson), Falcon (Anthony Mackie), Hawkeye (Jeremy Renner), Scarlet Witch (Elizabeth Olsen) and Black Panther (Chadwick Boseman).
"Civil War" will arrive on May 6, 2016 Stateside. Anthony and Joe Russo return as directors.
