The Peabody Award-winning "answer-and-question" quiz show is hosted by Alex Trebek, who's been at the helm since the current version was syndicated in 1984. It features a number of popular tournaments for teens, teachers, celebrities, kids and college students, but the granddaddy of them all is the Tournament of Champions.
A hit sitcom built on often-raunchy material, starring Charlie Sheen and, later, Ashton Kutcher begins with the premise of a Malibu bachelor (Sheen) whose life is disrupted when his brother and 10-year-old nephew move in with him. In the ninth season, Kutcher replaces Sheen, playing a billionaire with a broken heart. Briskly written and performed, the sitcom had fun spoofing Charlie Sheen's bad-boy reputation (which ultimately led to his exit from the series) and Jon Cryer's nervous energy.