England, the 12th century. Robber baron Irongron is recruited by Linx, a Sontaran warrior whose starship has been forced down on Earth. Linx is forced to use a time-travel device to steal resources and scientists from the future to repair his ship, but in doing so involves UNIT and the Doctor...
Quest roles:
Nicholas Courtney(Brig. Lethbridge-Stewart), Alan Rowe(Garif), Donald Pelmear(Professor Rubeish), June Brown(Eleanor), Jeremy Bulloch(Hal), Sheila Fay(Meg), Gordon Pitt(Eric), Kevin Lindsay(Styre / The Marshal)