Everett Collection

1994–1998, Nickelodeon. Alex Mack replaced the more frequently reminisced over Clarissa Explains It All on the "SNICK" lineup in 1994 and quickly took over the role of providing a cool-as-hell role model for tweenage girls who were more interested in adventures than boys. Alex Mack was about a seventh-grader who, after her first day of junior high, is nearly hit by a chemical plant's truck and is coated in the top-secret chemical GC-161 in the process. After the incident, she develops magic powers: telekinesis, morphing, and the ability to transmit bolts of electricity through her fingertips. She can't always control her newfound abilities and glows brightly when she's nervous. In other words, she is everything. Larisa Oleynik — who later dated her 10 Things I Hate About You costar Joseph Gordon-Levitt from 1999–2002, and is currently married to Ken Cosgrove on Mad Men — played Alex to perfection, and her best friend Ray was the dude pal we all wanted. Love you, Alex Mack.