5. LARISSA OLEYNIK

Show: The Secret World of Alex Mack
Alex Mack was so cool, especially with her overalls and signature backwards cap. As the chick who can turn herself into a puddle of water and transmit electricity through her fingers, she was the kind of girl who we wanted to hang out with. Needless to say, seeing her as the beautiful Bianca Stratford in 10 Things I Hate About You at the height our of own puberty was a bit unsettling. Fortunately, Oleynik still acts and has had minor roles on Mad Men and Hawaii 5-0.