Dr Who - 135 - Planet of Fire - Synopsis
Dr Who - Peter Davidson - Series 21 - ep 5 - tep 135
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A young American girl, Peri, discovers a strange artefact while holidaying with her step-father in the Mediterranean. After an accident, Turlough brings her aboard the TARDIS to recover. The artefact leads the Doctor to the volcanic world of Sarn, where Turlough begins to find the natives strangely familiar. Peri is left behind on the TARDIS with Kamelion, who begins to act strangely, finally shapeshifting into the form of the Master!