Summer Glau

Summer Glau (; born July 24, 1981) is an American actress best known for her roles in science fiction and fantasy television series: as River Tam in ''Firefly'' (2002) and its continuation film ''Serenity'' (2005), as Tess Doerner in ''The 4400'' (2005–2007), as Cameron in ''Terminator: The Sarah Connor Chronicles'' (2008–2009), and as Isabel Rochev / Ravager in ''Arrow'' (2013–2014). Provided by Wikipedia