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 Doctor investigates the disappearance of his earlier incarnation. He follows the trail to the outskirts of Seville, where a monstrous experiment is about to begin…
The evil Chessene puts in motion her plan to acquire the power of time travel — a plan that will change the Doctor's very nature…
As Peri and Areta begin to become a bird and a reptile, the Doctor faces Sil, who has negotiated to own all mining rights on Varos, depriving the Doctor of what he needs...
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...
