Marvel's Avengers: Age of Ultron teaser trailer leaked last week , and it looks as if there is a new woman joining the Avengers team.

At the 37-second mark of the teaser trailer, a dark-haired woman can be seen standing next to Thor (Chris Hemsworth) as Ultron (voiced by James Spader) addresses the Avengers. She also appeared in the Age of Ultron footage that premiered during last night's Agents of S.H.I.E.L.D. episode. Yahoo Movies reports that the mystery character was suspected to be Jane Foster (played by Natalie Portman in the Thor series), former S.H.I.E.L.D. operative Maria Hill (Cobie Smulders), or even the new Captain Marvel Carol Danvers . However, Disney confirmed to the site that the woman is actually South Korean actress Claudia Kim, also known as Kim Soo-hyun. Some then theorized that Kim might be playing Stark Industries scientist Suzi Endo, but Disney remained tight-lipped about the actress' role.In other Age of Ultron news, director Joss Whedon gave a possible Civil War storyline tease , which has been confirmed to be the focus of the recently announced Captain America: Civil War.Marvel's Avengers: Age of Ultron will be released May 2015.

Rachel is a freelance writer for IGN. You can follow her on Twitter at @haasrachel