Dalek

the common appearance of a Dalek

Daleks, also refered to as Rizzikkiaiza by the Combines, were the mutated descendants of the Kaleds of the planet Skaro encased in polycarbide and Dalekanium armour. The Doctor was described — by the Eleventh Doctor himself — as the Daleks' "enemy". The Eleventh Doctor also described the Daleks as his "oldest and deadliest enemy". He considered them to be "the worst thing in all creation" and boasted that he beat them time and time again. He noted that they hated him and wanted to kill him.The Daleks fought the Time Lords in the Last Great Time War, ending in the near-total destruction of the Dalek race. Intensely xenophobic and bent on universal (now multiversial) domination after the destruction of their own planet, the Daleks were hated and feared throughout the Doon'kin Universe (Alpha).