In the third episode of the four-part story "Enlightenment," the Doctor (Peter Davison) must prevent the Eternals, a parasitic alien race, from winning an extraterrestrial yachting competition, thereby placing themselves in a position to rule the Universe. Complicating matters is Captain Wrack (Lynda Baron) of the space yacht Buccaneer, who has been anointed with awesome special powers by the Doctor's old nemesis, the Black Guardian (Valentine Dyall). Written by Barbara Clegg, "Enlightenment, Episode 3" first aired on March 8, 1983. ~ Hal Erickson, Rovi