Summer Glau
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Summer Lyn Glau (/ˈɡlaʊ/; 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 / Allison Young in Terminator: The Sarah Connor Chronicles (2008–2009), as Bennett Halverson in Dollhouse (2009–2010), as Skylar Adams in Alphas (2011–2012) and as Isabel Rochev / Ravager in Arrow (2013–2014).

Glau was born in San Antonio, Texas, where she grew up with her two younger sisters Kaitlin and Christie. She is of Scots-Irish and German ancestry. Her mother is a schoolteacher, and her father a general contractor.

Glau received a scholarship to a ballet company and was homeschooled from grades 3 to 12 to accommodate her ballet training. Glau was classically trained as a ballet dancer and studied tango and flamenco. After a broken toe ended her dancing career, Glau moved to Los Angeles in 2002 to pursue an acting career.