What is a Dalek?

A Dalek “DAH-leck”, is a member of a fictional extraterrestrial race of mutants from the British science fiction television series Doctor Who. A Dalek is a grotesque mutated organism integrated with a tank-like mechanical casing made of “dalekanium“. 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)). The Daleks were created by writer Terry Nation and BBC designer Raymond Cusick and were introduced in December 1963 in the second Doctor Who serial. They became an immediate hit with viewers, featuring in many subsequent serials and two 1960s motion pictures. They have become synonymous with Doctor Who, and their behaviour and catchphrases are part of British popular culture “Hiding behind the sofa whenever the Daleks appear” has even been cited as an essential element of British cultural identity, along with Bovril and afternoon tea. The word “Dalek” has entered the Oxford English Dictionary and other major dictionaries; the Collins Dictionary defines it rather broadly as “any of a set of fictional robot-like creations that are aggressive, mobile, and produce rasping staccato speech”. It is also a trademark, having first been registered by the BBC in 1964 to protect its lucrative range of Dalek merchandise.

Source: Wikipedia