Classic British sci-fi adventure starring Tom Baker. In search of a fragment of the Key of Time on the planet Tara, the Doctor and Time Lady, Romana are apprehended by local forces.

Classic British sci-fi adventure starring Jon Pertwee. The Silurians contact Quinn for help retrieving the cohort, and the Doctor and the Brigadier organise a search of the moors.

Classic British sci-fi adventure starring Jon Pertwee. When Quinn turns up dead, the Brigadier leads an armed party into the caves. Meanwhile, the Doctor tries to reach out to the Silurians.

Classic British sci-fi adventure starring Jon Pertwee. The Brigadier summons the Doctor and Liz to his research centre after several of his staff suffer nervous breakdowns. (1970)

Classic British sci-fi adventure starring Jon Pertwee. While the Doctor and Liz try to find a cure to the virus spread by Baker, the young Silurian seizes control of his people.

Classic British sci-fi adventure starring Jon Pertwee. While Liz neutralises the threat of the virus, the Doctor learns of an even more devastating Silurian plan.

Classic British sci-fi adventure starring Jon Pertwee. While UNIT attempts to penetrate Earth's core in search of a vast energy source, the Doctor tries to end the exile imposed upon him.

Classic British sci-fi adventure starring Jon Pertwee. Having been catapulted into a dimensional void, the Doctor is disturbed by an unusual screeching noise and a series of mutations.

Classic British sci-fi adventure starring Jon Pertwee. The Doctor finds himself in a parallel universe where the Inferno Project is policed by nefarious versions of his friends.

Classic British sci-fi adventure starring Jon Pertwee. The Doctor tries to warn the Inferno staff in the alternate universe that penetrating the Earth's crust will end in disaster.

Classic British sci-fi adventure starring Jon Pertwee. While UNIT attempts to penetrate Earth's core in search of a vast energy source, the Doctor tries to end the exile imposed upon him. (1970)