A Dalek (pronunciation (help·info) "ah-leck", IPA: /ˈdɑːlək/) is a member of a fictional extraterrestrial race of mutants from the British science fiction television series Doctor Who. Daleks are organisms from the planet Skaro, integrated within a tank-like mechanical casing. The resulting creatures are a powerful race bent on universal conquest and domination, utterly without pity, compassion or remorse (as all of their emotions were removed except hate). They are also, collectively, the greatest alien adversaries of the Time Lord known as the Doctor. Their most famous catchphrase is "EX-TER-MI-NATE!", with each syllable individually screeched in a frantic electronic voice (play sample (help·info)).