Profiling married entertainers Desi Arnaz and Lucille Ball, and chronicling the rise and fall of their creative empire, Desilu Studios, which produced "Star Trek," "I Love Lucy" and "Mission: Impossible." Interviews: Steve Allen, Milton Berle, Whoopi Goldberg, Lily Tomlin, Jenna Elfman, Carol Burnett, Sid Caesar and the couple's daughter, Lucie Arnaz.