It has been roughly half a century since the Doctor, portrayed by Jon Pertwee, assisted the ruler of Peladon in breaking a severe curse, and now he and Sarah Jane, played by Elisabeth Sladen, are back at the citadel to find that the current queen, Nina Thomas, is under the influence of her chancellor, Frank Gatliff’s Ortron, and confronting an uprising from the miners who feel exploited as essentially slaves. Complic…