Daleks

The Daleks were a warrior race made up of genetically engineered mutants belonging to fundamental DNA type 467-989 who were originally from the planet Skaro. The mutants were usually encased inside armour consisting of polycarbide and the metal Dalekanium.

On many occasions, the Daleks openly acknowledged a single Time Lord, the Doctor, as their greatest enemy. The Doctor described them likewise, and in their tenth incarnation, stated that a Dalek was "not just metal, it was alive," that "inside that shell, there was a creature born to hate, whose only thought was to destroy everything and everyone that wasn't a Dalek, too." The War Doctor also said that Daleks were "not robots", but "savage, incredibly intelligent, living, breathing creatures housed inside a war tank".

The Daleks fought the Time Lords in the Last Great Time War, ending in the near-total destruction of the Dalek race, until they rebuilt their empire by using a progenitor. Intensely xenophobic and bent on universal domination, the Daleks were hated and feared throughout time and space.