Summer Glau

 The first time she appeared on TV was as a guest star on the 2002 episode of Angel. There she caught the eye of director Joss Whedon, who then cast her in his critically acclaimed , but brief-lived TV series Firefly as River Tam, a role she reprised for the sequel feature film to the show Serenity. Glau had previously auditioned for the Power Ranger role (White Wild Force Ranger, Alyssa Erile) in Power Rangers Wild Force. But, she fell short to Jessica Rey before meeting Whedon. She was the role of Shelly who was a high school senior in the episode Sleepover. She also appeared in the CSI: Crime Scene Investigation episode, "What's Eating Gilbert Grissom?" " as well as season 2 of The Unit as Crystal Burns (the girlfriend of Jeremy Erhart). In 2006, Glau played Tess Doerner, a paranoid schizophrenic returnee in season two's premiere of The 4400, and became an recurring character from season three onwards. Mammoth was her horror comedy role. Glau played the role of The Initiation of Sarah, an ABC Family TV film. Glau played Cameron Phillips an infiltration unit of the Terminator which was returned to Skynet to guard John Connor (and Sarah Connor). The series' seventh episode, "The Demon Hand", featured scenes in which Glau (as Cameron) dances ballet. Glau also played Allison Young (Cameron’s human doppelganger from episodes from the second season, "Allison of Palmdale" and"Born to run". Glau also appeared as herself in an episode in 2009 of the CBS situation comedy The Big Bang Theory