When several scientists disappear from a 20th Century research facility, The Doctor soon discovers who is responsible. The Sontaran, Linx has brought the scientists to the middle-ages to repair his ship. Linx has promised to bestow weapons to the power hungry Irongron; if successful, Earth’s entire technological evolution will be disrupted. The Third Doctor and Linx fight in Irongron's Castle. . Cast Jon Pertwee (Doctor Who), Elisabeth Sladen (Sarah Jane Smith) Nicholas Court

The Doctor has been exiled to Earth by the Time Lords, and has been forced to regenerate into this third incarnation. He’s not the only alien to arrive on Earth: the Nestenes have arrived, and along with the deadly Autons, they plan to conquer the Earth. Cast Jon Pertwee (Doctor Who), Caroline John (Liz Shaw), Nicholas Courtney (Brigadier Lethbridge-Stewart) Hugh Burden (Channing), Hamilton Dyce (Major General Scobie), Talfryn Thomas (Mullins) John Breslin (Captain Munro), An