Two alien seed pods are found buried in the Antarctic permafrost and the Doctor realises that they are from a Krynoid, a form of plant life that infects and transforms all animal life on planets upon which it becomes established.

The Doctor travels to Victorian London only to be rapidly drawn into a fiendish plot involving disappearing women, an Oriental stage magician with uncanny powers, a murderous ventriloquist's dummy, and giant rats in the sewers.

The Doctor travels to Victorian London only to be rapidly drawn into a fiendish plot involving disappearing women, an Oriental stage magician with uncanny powers, a murderous ventriloquist's dummy, and giant rats in the sewers.

Two alien seed pods are found buried in the Antarctic permafrost and the Doctor realises that they are from a Krynoid, a form of plant life that infects and transforms all animal life on planets upon which it becomes established.

The Doctor and Peri encounter a brain surgeon whose experiments have led to horrible mutations.

Crozier is looking for another body to house Kiv's brain.

Time-traveler plans to ensure Harold's victory at Battle of Hastings.

The Doctor and Sarah encounter Professor Sorenson who plans on transporting anti-matter.

The Doctor and Sarah arrive too late, and a ravenous monster emerges from Zeta Minor.

The Doctor and Sarah continue their efforts to stop the release of deadly anti-matter.

The Doctor realizes not only must he save the universe, but Sorenson, from himself.

When the TARDIS lands in the village of Devesham, the Doctor realizes that the local people are all android duplicates, and that they're not on Earth at all.

The Tardis is captured by the Mandragora Helix. The doctor realizes the Mandragora energy is loose and enters an underground temple and reveals itself to the outlawed Brotherhood of Demnos.