There are few things better than reconnecting with old friends. Except when they're now-famous old friends on TV.
While George Clooney and Shannen Doherty had excellent reunions with their old TV friends, not all reunions have resulted in heartwarming nostalgia. We rate history's biggest TV comebacks, from David Duchovny's triumphant return to "The X-Files" to Clay Aiken's awkward fan encounter on "American Idol."
Best and Worst: TV comebacks