Martin Freeman has joined the cast of “Captain America: Civil War,” Marvel announced Tuesday.

Chris Evans and Robert Downey, Jr. star in the film, reprising their roles as Captain America and Iron Man, respectively. As the title suggests, the threequel to “Captain America: The First Avenger” will see some Avenger-on Avenger violence as the two teammates fight against each other.

Chadwick Boseman will also make his first appearance as Marvel superhero Black Panther in the film, and “Civil War” is also where the new Spider-Man is expected to make his first appearance. Daniel Bruhl was previously cast to play villain Baron Zemo.

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Details of Freeman’s character are under wraps.

“From his roles as Bilbo Baggins and Doctor Watson to Tim in ‘The Office,’ Martin’s range from the dramatic to the comedic has consistently impressed us,” said the film’s producer and Marvel boss Kevin Feige. “We couldn’t be more honored or excited to have such a talented actor join the Marvel Cinematic Universe.”

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Joe and Anthony Russo are directing the new “Captain America” movie, which hits theaters on May 6, 2016.

Freeman is best known for his Emmy-winning role as Dr. John Watson on “Sherlock” opposite Benedict Cumberbatch and for his role as Bilbo Baggins in “The Hobbit” trilogy. He is represented by Creative Artists Management in the UK and UTA.