Classic British sci-fi adventure starring Jon Pertwee. The Brigadier asks the Doctor to search for a number of missing scientists who, he discovers, have been sent back in time. (1973)

Classic British sci-fi adventure starring Peter Davison. The Doctor and his cohorts journey to the jungle world of Deva Loka, which is being surveyed for possible Earth colonisation.

Classic British sci-fi adventure starring Peter Davison. On Deva Loka, the Kinda, a race of resident apparent savages, have mentally unbalanced members of the Earth expedition.

Classic British sci-fi adventure starring Peter Davison. The Doctor and Todd receive a telepathic invitation to visit the Kinda's blind matriarch and her ward in a cave.

Classic British sci-fi adventure starring Peter Davison. A Kinda seer imparts a terrifying vision upon the Doctor, who must find a way to defeat the Mara and save the Kinda.

Classic British sci-fi adventure starring Peter Davison. The TARDIS lands on Manussa where Tegan is possessed by the Mara, who plot to break into the physical world.

Classic British sci-fi adventure starring Peter Davison. The Doctor tries to halt the 500th anniversary celebrations, while a possessed Tegan finds herself in Dugale's Hall of Mirrors.

Classic British sci-fi adventure starring Peter Davison. Tegan and Lon try to locate the Great Crystal, while the Doctor finds himself in prison and reliant on Nyssa to try and get him out.

Classic British sci-fi adventure starring Peter Davison. Having escaped from jail and avoided execution, the Doctor searches for Dojjen and attempts to defeat the Mara once and for all.

Classic British sci-fi adventure starring Peter Davison. When the Doctor crash-lands the TARDIS on the planet of Frontios, he encounters a group of humans afraid of meteorite impacts.

Classic British sci-fi adventure starring Peter Davison. When the TARDIS is destroyed, Turlough is forced to resort to desperate measures, before he and Norna discover the Tractators.