Bringing back a half century of television memories, this comprehensive documentary features clips from vintage newsreels and dozens of boob-tube classics such as "I Love Lucy," "Gunsmoke," "Dragnet," "Laugh-In," "Saturday Night Live" and "Dallas." Scores of small-screen icons -- including Steve Allen, Milton Berle, Art Linkletter, Carol Burnett and Walter Cronkite -- discuss the history of the medium and the parts they played in its development.