Brian Bonsall

Biography: Back in the mid-1980s, this cute kid was guilty of helping Family Ties jump the shark after he joined the sitcom as the Keaton clan's youngest member when he was just 4 years old. After the series was canceled, he popped up in guest spots, sentimental TV-movies and the occasional film (as the murderous title character in Mikey). In 1994, after wrapping up a recurring role as Worf's adolescent Klingon son on Star Trek: The Next Generation, the 13-year-old retired from acting. But he didn't abandon his artistic aspirations, founding a succession of punk bands including Late Bloomers and Thruster.