The rise and fall of those in the spotlight - politicians, athletes and entertainers - is the stuff of great drama, and in the case of Mr. Saturday Night, great comedy as well. Director and star Bill Crystal traces the trajectory of stand-up comedian Buddy Young, Jr. (Crystal, When Harry Met Sally...) and his monumental fall. From humble beginnings, performing stand-up comedy routines in the Catskills, to his meteoric rise as television's reigning King of Saturday Night Comedy programming, Crystal plums the highs and lows of a comic genius whose self-destructive behavior jeopardizes his personal life and career.