Classic Doctor Who: The Fourth Doctor

The Doctor and Leela are on Fang Rock island where a murderous creature is at large.

The survivors are in the lighthouse, but the Doctor is still worried about the creature.

The alien Rutan begins to pick off the remaining humans one by one.

The Doctor is infected by an alien virus and becomes possessed by the will of the Nucleus.

As the Doctor's condition worsens, he tells Leela to take him to the Bi-Al Foundation.

The Doctor and Leela have been cloned, miniaturised and injected into the Doctor's body.

The Nucleus has escaped the Doctor's body and grown to human size.

At Fetch Priory a mysterious skull is exerting a deadly influence on those around it.

The Doctor realises the skull is an ancient horror from the mythology of his own people.

Stahl intends to control the power of the Fendahl for himself.

Thea has become the Fendahl Core and transforms everyone into Fendahleen.

The TARDIS arrives on a dystopian Pluto where a large company exploits it's workers.

The Doctor is taken prisoner by the Gatherer and sent to the Correction Centre.

Leela has been captured by the Gatherer and is sentenced to death by public steaming.

The rebels turn on the Gatherer while the Doctor confronts the real head of the Company.

The Doctor encounters the survivors of Minyos, who are searching for a lost spacecraft.

The Minyans unexpectedly find the P7E spacecraft, but their arrival is not welcomed.

The Doctor and Leela attempt to access the Citadel of the Seers to rescue Idas's father.

The Doctor is suspicious when the Oracle allows Jackson to take the Minyan's gene banks.

The Doctor returns to Gallifrey to claim his position as President of the Time Lords.

The Doctor orders K9 to lower the Gallifrey's defences.

The Doctor is accused of betrayal when the Vardans invade Gallifrey.

As the Vardans materialise on Gallifrey, the Doctor prepares to spring his trap.

The Sontarans attempt to take full control of Gallifrey.

A dangerous game of hide and seek begins inside the TARDIS when the Sontarans get in.