Actress Allison Mack began her career at a young age. She was appearing in commercials when she was only a toddler, and she began studying at the Young Actor's Space in Los Angeles when she was just seven. She was appearing in TV movies by the time she was eight, wracking up a considerable resumé by the time she was in her teens. It was then that she gained some attention for playing a troubled teen in an episode of 7th Heaven, which led to an audition for the series Smallville. Mack was cast as Chloe Sullivan, a character that proved to be extremely popular.