The Daleks were a race of genetically engineered mutants belonging to fundamental DNA type 467-989 who were originally from the planet Skaro. They were usually encased inside armor consisting of polycarbide and Dalekanium. On many occasions, the Daleks openly acknowledged a single Time Lord, the Doctor, as their greatest enemy. The Doctor described them likewise, and his tenth incarnation stated that a Dalek was "not just metal, it was alive," and 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.