Laura Vandervoort
Vandervoort's Supergirl was the latest in a long line of superheroes to make appearances on "Smallville," which recounted the adolescent years of Clark Kent discovering his superhuman powers before he dons the Superman cape. With her debut in the first episode of the show's seventh season in the fall of 2007, Vandervoort played Clark's Kryptonian cousin Kara, who had been in suspended animation since their home planet exploded. Her advanced powers included the ability to fly - a trick Clark had yet to master - and Vandervoort's strong-willed and independent-minded Kara promised to shake things up on the long-running series.