20. Amanda Woodward, 'Melrose Place'
Quick: Name a show about a high-powered, highly sexed advertising executive who emerged from an abusive past by seducing, fighting, lying, and occasionally actually earning their way to the top, even faking death to start a new life. Good guess, but Melrose Place did it with Amanda Woodward when Don Draper wasn't even a twinkle in Matthew Weiner's eye. Introduced late into the era-definining drama's first season and played by Heather Locklear, whose stint on Dynasty gave her an impeccable primetime-soap pedigree, Amanda's unpredictable secrets and voracious appetite for the male characters made her a sensation. Like several villains on this list, she was an afterthought addition who wound up taking over the whole damn show.