Miniseries still rank among the top-rated programs in television history; they were major events that captured the nation’s imagination. “Roots” was the biggest — interviewed about that groundbreaking series are stars LeVar Burton, Louis Gossett Jr., Leslie Uggams, Ben Vereen, John Amos, Georg Stanford Brown and Ed Asner. This episode also considers the very first miniseries, “Rich Man, Poor Man,” as stars Peter Strauss and Susan Blakely offer fresh insights. All of the key players from the landmark miniseries “The Thorn Birds” appear, providing surprising commentary about the romance seen by more viewers than any other in TV history. New interviews with Richard Chamberlain, Rachel Ward and Bryan Brown mark the 30th anniversary of one of television’s biggest events.