Back up to: Season 20
4/4 The Doctor and the original snakedancer Dojeen work to rid the planet of the Mara.
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3/4 The Doctor locates the Great Mind's Eye crystal but it is instrumental in the Mara's plan.
2/4 Tegan tries to rid her mind of the Mara forever.
1/4 The Mara is returning home to the planet Manussa, five hundred years after being exiled.