Kaled

Kaleds were one of the two humanoid races which originally inhabited the planet Skaro (the other being the Thals). The creatures which inhabit and control the Dalek machines are a highly mutated form of Kaled, the result of the nuclear and biochemical warfare waged for centuries between the Kaleds and Thals on ancient Skaro, as well as the genetic tampering of the Daleks' creator, Davros.