In the conclusion of the six-part story "The Green Death," the Doctor (Jon Pertwee) continues his efforts to fend off an invasion by a pollution-generated species of huge, radioactive maggots. Salvation comes unexpectedly, as the fungus discovered by the Doctor's companion Jo Grant proves to be a most effective maggot deterrent. But there's still a plot twist or two before the final fadeout. This episode represented the series farewell of Katy Manning (Jo Grant, who left Doctor Who to marry actor Stewart Beven, here cast as Jo's latest heartthrob, ecologist Prof. Clifford Jones). Written by Robert Sloman, "The Green Death, Episode 6" originally aired on June 23, 1973, bringing the tenth season of Doctor Who to a rousing conclusion. ~ Hal Erickson, Rovi