The first episode of the classic Doctor Who story The Time Warrior was Broadcast 16 December 1973 featuring Jon Pertwee and Elizabeth Sladen. It begins In the Middle Ages, where the evil and Cruel Warlord Irongron and his Master-at-Arms Bloodaxe, discover the crashed spaceship of an alien Sontaran warrior named Commander Linx. Linx strikes a bargain with Irongron and offers him high tech weapons in exchange for materials and help in repairing his ship.
Meanwhile back in the present day scientists are mysteriously vanishing from a top secret research complex and The Doctor and Brigadier Lethbridge-Stewart (Nicholas Courtney) of U.N.I.T. are called in to investigate. The Doctor discovers that a Sontaren Commander is at large and has kidnapped the scientists by means of an Osmic Projector which has allowed him to project himself 800 years into the future, from the Middle Ages to the present day and kidnap and brain wash them into helping him rebuild his damaged spaceship. The Doctor also meets an eccentric scientist called Rubeish and a inquisitive young journalist called Sarah Jane Smith, (Elizabeth Sladen), who has infiltrated the complex by masquerading as a Scientist. Then Rubeish also disappears. The Doctor Journeys to thr Middle Ages, unaware that Sarah-Jane has stowed aboard the Tardis
Lord Edward of Wessex Castle sends his archer Hal on an unsuccessful mission to kill Irongron. Meanwhile Sarah Jane is also captured and brought before Irongron. Linx then constructs a Robot Knight which almost clobbers Hal until a timely intervention by The Doctor stops it and in The ensuing confusion both Hal and Sarah flee, and head for Wessex Castle.The next morning irongron and his troops attack the castle using high-tech weapons supplied by Linx. Meanwhile Doctor and Sarah-Jane infiltrate the Castle disguised as monks to try to foil Linx’ sinister plan, rescue the scientists and defeat Irongron.