Actress Felicia Day has reportedly joined the cast of The Avengers as S.W.O.R.D. agent Abigail Brand. The actress was added to the movie's IMDB page, although it has not been confirmed by Marvel Studios that the actress has been cast.
S.W.O.R.D. is an off-shoot of S.H.I.E.L.D. in the Marvel comic books, which stands for Sentient World Observation and Response Department. The agency is responsible for preventing alien threats. The Avengers director Joss Whedon actually created the S.W.O.R.D. organization in the Marvel comic book series. Abigail Brand is the leader of S.W.O.R.D., although it is not known how big her role is in The Avengers.
The Avengers is currently filming, with a release date set for May 4, 2012.