Monster Files: Daleks

Daleks have little to no individual personality, ostensibly no emotions other than hatred and anger, and a strict command structure, conditioned to obey superior orders. Dalek speech is characterised by repeated phrases, and by orders given to themselves and to others. Dalek vocal inflection suggests perpetual anger, sometimes verging on hysteria.

Over the course of the series, Daleks have usually been depicted speaking in English; however, in "Journey's End" a squad of Daleks operating in Germany is heard shouting orders in German. This suggests that the Dalek travel machine is capable of translating speech into any language, and that, like the speech of most aliens featured in the series, Dalek language only sounds like English to the Doctor's companions because it is being translated by the TARDIS.