Doctor Who: Daleks

Daleks do not care about anything except for themselves. Constantly purging or making war against what they see as the unpure and inferior beings in the universe. Characteristically distinguished by their metal chassis and their metallic sounding voices which usually utter the word "Exterminate" over and over again. Extremely dangerous and would be considered an act of suicide to go against them especially if they outnumber you -- unless of course you have the Doctor by your side!