Daleks through the ages

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).[1] They are also, collectively, the greatest extraterrestrial enemies 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