What is "Jeopardy"? It's only one of the longest-running and most popular quiz programs in the history of television. This behind-the-scenes look at what happens when the lights go down includes interviews with members of the show's talented crew of writers, researchers, producers and "the Clue Crew" -- and, of course, a chat with host Alex Trebek -- as well as clips from some of the program's most popular episodes.