The Thals are a fictional race of humanoid aliens from the British science fiction television series Doctor Who, originating on the planet Skaro.
According to Thal history as given by them in the original Dalek story (1963), they were once a warlike race, but following a terrible war with the peaceful and scientific Dals who shared their planet, they renounced violence and became pacifist farmers. After centuries of this lifestyle, they were forced to take up arms again when the Dals — now developed into the aggressive and xenophobic Daleks — returned and attempted to wipe them out.
This history was revised in Genesis of the Daleks (1975), which revealed the detailed origin of the Daleks. The race (or nation) the Thals were at war with was the Kaleds, who at the time of the fourth Doctor’s arrival were a fascistic society involved in a generations-long war of attrition with the Thals (whose use of slave labour did not make them much better, although all slaves were freed and given a…