Show:Twin Peaks
Madchen Amick makes our list by default. Despite the murder mystery series being fully casted, producers loved her audition so much that they wrote in a new, albeit tragic, part for her. As Shelly Johnson, a diner waitress and high school drop-out caught between a loveless, abusive marriage and a passionate yet dangerous affair with another man, Amick seemed to be the ideal combination of small-town vulnerability and otherworldly sex appeal.