15. 'Beverly Hills 90210'
The teen drama that launched a thousand knockoffs — without it, there would be no Dawson's Creek, no Gossip Girl, no Vampire Diaries (basically, no CW at all). Jason Priestley and Shannen Doherty starred as Brandon and Brenda Walsh, twin transplants to the tony community of Beverly Hills; Luke Perry starred as prodigiously sideburned hearthrob Dylan McKay; teenagers nationwide became obsessed. 90210 may have been a teen soap opera, but it fetishized style with such hitmaking power that its chic look became its substance, which anyone who's spent time checking out the popular kids in the hallways can tell you is more representative of classroom cliques than we'd care to admit.