Journalist Sarah Jane Smith is impersonating her aunt, virologist Lavinia Smith, in order to gain access to a research centre where top scientists are being held in protective custody while UNIT investigates the disappearance of a number of their colleagues. The missing scientists have been kidnapped by a Sontaran, Linx, and taken back to medieval England, where they are working under hypnosis to repair his crashed spaceship.
UNIT investigates when scientists go missing kidnapped by an alien trapped in the 13th Century.
The Doctor discovers that the alien is a Sontaran warrior called Linx who is trying to repair his spaceship.
Linx is providing advanced weaponry to Irongron and his men who prepare to attack Sir Edward’s castle.
The Doctor races to save the captured scientists and to prevent the course of history being changed.
Third DoctorJon Pertwee
Sarah Jane SmithElisabeth Sladen
Alistair Gordon Lethbridge-StewartNicholas Courtney
LinxKevin Lindsay
Professor RubeishDonald Pelmear
EleanorJune Brown
Edward of WessexAlan Rowe
HalJeremy Bulloch
MegSheila Fay
EricGordon Pitt
IrongronDavid Daker
BloodaxeJohn J Carney
SentrySteve Brunswick
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