4/4 The Doctor and the original snakedancer Dojeen work to rid the planet of the Mara.
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.
4/4 Omega has been reborn but as a walking anti-matter bomb.
3/4 Within the Matrix, the Doctor unmasks Omega and realises the threat is far from over...
2/4 Commander Maxil doesn't believe the Doctor is innocent.
1/4 The Doctor and Nyssa trace something odd to Amsterdam…