Part One
Series Episode Number: 356World Premiere: Sat 15 Dec 1973 - 5:10pm GMT [BBC One] (United Kingdom)
First Broadcast: Sun 2 Oct 1983 - 11:00pm CDT [WTTW 11 Chicago]
Running Time: 24 minutes 15 seconds
8.70 Million (UK)
Appreciation Index: 59 (UK)Chart Position: 34 () (UK)
Recorded on Mon 28 May 1973 in TC6
Archive State: PAL 2 VT
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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