The Daleks i/ˈdɑːlɛks/ are a fictional extraterrestrial race of mutants principally portrayed in the British science fiction television series Doctor Who. Within the series narrative, Daleks are cyborgs made from their original forms, extraterrestrial Kaleds from the planet Skaro, genetically modified and integrated within a tank-like robotic mechanical shell. They were created by the scientist Davros during the final years of a thousand-year war against the Thals. The Daleks are a powerful race bent on universal conquest and domination, utterly without pity, compassion or remorse. Various storylines portray them as having had every emotion removed except hate, leaving them with a desire to purge the Universe of all non-Dalek life. Collectively they are the greatest enemies of the series' protagonist, the Time Lord known as the Doctor. They are popularly known for their catchphrase "Exterminate!" and are a well-recognised reference in British popular culture, listed in several major dictionaries.