As UNIT are transporting a nuclear warhead around Carbury, knights in armour arrive to continue waging a war that began thousands of years ago, but in a wholly different dimension.
Quest roles:
Nicholas Courtney(Brig. Lethbridge-Stewart), Jean Marsh(Morgaine), June Bland(Elizabeth Rawlinson), Marcus Gilbert(Ancelyn), James Ellis(Peter Warmsly), Angela Douglas(Doris Lethbridge-Stewart), Christopher Bowen(Mordred), Angela Bruce(Brigadier Winifred Bambera), Robert Jezek(Sergeant. Zbrigniev)