Marvel has announced that Martin Freeman (Sherlock, The Hobbit) has joined the cast of the upcoming superhero film Captain America: Civil War, which will be released on May 6th, 2016. As of now, his character is not known.
Producer Kevin Feige states:
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. We couldn’t be more honored or excited to have such a talented actor join the Marvel Cinematic Universe.
The Civil War comic series focused on the Superhero Registration Act, a move by the U.S. government to force superheroes to act as regulated officers. Captain America leads a group of mutants who are opposed to this idea while Iron Man leads a group that are all in favor.
The comic story is widely known for having led to the assassination of Captain America, although it should be taken into account that the films have deviated from the comic stories in some rather drastic ways. For example, Ultron was originally created by Ant-Man in the comics, not Tony Stark.

