UNIT investigates when scientists go missing, kidnapped by an alien trapped in the 13th Century. Travelling back in time in the TARDIS, the Doctor is unaware that he has stowaway.
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The Doctor discovers that the alien is Linx - a Sontaran warrior trying to repair his spaceship. Sarah is convinced that the Doctor is responsible for the abductions.
Linx is providing advanced weaponry to Irongron and his men who prepare to attack Sir Edward's castle. The Doctor is forced to improvise a defence, but will it be enough?
As the repairs to Linx's spaceship are completed and he prepares to take off, the Doctor races to save the captured scientists and to prevent the course of history being changed.