Paul Rudd and Paul Bettany are set to appear in the third Captain America film.
The actors will reprise their superhero roles as Scott Lang/Ant-Man and The Vision respectively for Captain America: Civil War, which has begun production in Georgia.
Paul will make his first appearance alongside the Avengers in Captain America 3, after making his Marvel debut in Ant-Man in July.
The duo join previously announced cast members including Chris Evans (Steve Rogers/Captain America), Robert Downey Jr (Tony Stark/Iron Man), Scarlett Johansson (Natasha Romanoff/Black Widow), Sebastian Stan (Bucky Barnes/Winter Soldier) and Anthony Mackie (Sam Wilson/Falcon).
Jeremy Renner (Clint Barton/Hawkeye), Don Cheadle (Jim Rhodes/War Machine) and Elizabeth Olsen (Wanda Maximoff/Scarlet Witch) will also be back in their Marvel roles.
Other stars appearing in Captain America 3, directed by brothers Anthony and Joe Russo, include Chadwick Boseman as T’Challa/Black Panther, Emily VanCamp, Frank Grillo, William Hurt, Daniel Bruhl and Martin Freeman.
The third instalment picks up where Avengers: Age Of Ultron left off, as Captain America leads the new team of Avengers in their continued efforts to safeguard humanity.
But the group face a split as they try to protect the world from a new and nefarious villain.
Captain America: Civil War will be released in UK cinemas in April 2016.
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