Classic British sci-fi adventure starring Patrick Troughton. In the future, planet Earth relies entirely on a transport system managed on the Moon that has inexplicably stopped working.

Classic British sci-fi adventure starring Patrick Troughton. The Doctor manages to return to Earth with his allies only to find the Ice Warriors have seized the weather control station.

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.

Classic British sci-fi adventure starring Jon Pertwee. The Doctor tries to convince everyone that there are monsters in the caves, prompting Major Baker to take a shot at a reptile man.

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. Worried about the elder Silurian's growing friendship with the Doctor, the younger Silurian forms a plan to scupper their camaraderie.

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.