Kathryn Felicia Day (born June 28, 1979) is an American actress and writer. She played the character "Vi" on the TV series Buffy the Vampire Slayer and acted in movies such as Bring It On Again and June, as well as the Internet musical, Dr. Horrible's Sing-Along Blog and currently has a recurring role as Charlie on Supernatural. She is the star, writer, and producer of the original web series The Guild, a show loosely based on her life as a gamer. She also wrote and starred in the Dragon Age web series Dragon Age: Redemption. Day was a member of the board of directors of the International Academy of Web Television beginning December 2009 until the end of July 2012.
She will be one of the guests at the New York Comic Con 2013.