Photos of Summer Glau one of the hottest girls in movies and TV. Summer began as a ballerina but moved into acting after a serious injury to her ankle. She first appeared in an episode of "Angel" where Joss Whedon spotted her and had her audition for a role in his new show "Firefly". Summer went on to play River Tam in both "Firefly" and it's movie "Serenity" . She then went on to star in such shows as "The 4400" , "Terminator: The Sarah Connor Chronicles," and "The Cape" .