The Visitation

Failing to take Tegan to Heathrow Airport, the TARDIS lands in the 17th Century.  After exploring, the Doctor and his companions find a space capsule has crash-landed, and three Terileptil prison escapees intended to wipe out the population of the Earth by releasing rats infected with an enhanced form of the great plague.

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Are we ever really alone?  The Doctor finds himself delving into questions of the past and future to find the answer to this question.

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