Nicola Bryant

Mestor's true plan is revealed and the Doctor's old Gallifreyan friend Azmael comes to the realisation that he has been corrupted long enough by the Gastropod leader.

On Telos the Doctor is reintroduced to the Cyber Leader and meets the Cryons, the planet's original inhabitants who want their planet back and will go to any lengths to do so...

The Governor forces the Doctor to tell him everything he knows about the true value of Zeiton-7, but Sil attempts to derail his plans by subjecting Peri and Areta to an enforced mutation.

The Doctor and Peri meet Jamie and learn the Second Doctor is with the Sontarans in Spain. At a hacienda, Chessene and the Sontarans set up base.

Mestor claims that all he wants is the Sylvest twins to help him repopulate his home planet. But the Doctor knows there's more to this than meets the eye.

On Jaconda, Mestor's cruel domination over the planet's population continues while on Titan Three, the Doctor seems to have been blown up in a booby-trapped building.