In the programme's narrative, the planet Skaro suffered a thousand-year war between two societies: the Kaleds and the Thals. During this time-period, many natives of Skaro became badly mutated by fallout from nuclear weapons and chemical warfare. The Kaled government believed in genetic purity and swore to "exterminate the Thals" for being inferior. Believing his own society was becoming weak and that it was his duty to create a new master race from the ashes of his people, the Kaled scientist Davros genetically modified several Kaleds into squid-like life-forms he called Daleks, removing "weaknesses" such as mercy and sympathy while increasing aggression and survival-instinct. He then integrated them with tank-like robotic shells equipped with advanced technology based on the same life-support system he himself used since being burned and blinded by a nuclear attack. His creations became intent on dominating the universe by enslaving or purging all "inferior" non-Dalek life.
The Daleks are the series' most popular and famous villains and their returns to television over the decades have often gained media attention. Their battle cry, a staccato "Exterminate!" has entered common usage as a popular catchphrase.
The Daleks became an immediate hit with viewers, returning for subsequent appearances throughout the 1960s. As early as one year after first appearing on Doctor Who, the Daleks had become popular enough to be recognized even by non-viewers. In December 1964 editorial cartoonist Leslie Gilbert Illingworth published a cartoon in the Daily Mail captioned "THE DEGAULLEK", caricaturing French President Charles de Gaulle arriving at a NATO meeting as a Dalek with de Gaulle's prominent nose.[6]
The Daleks have become as synonymous with Doctor Who as the Doctor himself, and their behaviour and catchphrases are now part of British popular culture.[7] "Hiding behind the sofa whenever the Daleks appear" has been cited as an element of British cultural identity,[8] and a 2008 survey indicated that nine out of ten British children were able to identify a Dalek correctly.[9] In 1999 a Dalek photographed by Lord Snowdon appeared on a postage stamp celebrating British popular culture.[10] In 2010, readers of science fiction magazine SFX voted the Dalek as the all-time greatest monster, beating competition including Japanese movie monster Godzilla and J. R. R. Tolkien's Gollum, of The Lord of the Rings.[11]
The word "Dalek" has entered major dictionaries, including the Oxford English Dictionary, which defines "Dalek" as "In the BBC television science-fiction series Doctor Who: a member of a race of aggressive alien mutants in mobile armoured casings. Frequently in extended, allusive, or similative use."[12] English-speakers sometimes use the term metaphorically to describe people, usually authority figures, who act like robots unable to break from their programming. For example, John Birt, the Director-General of the BBC from 1992 to 2000, was called a "croak-voiced Dalek" by playwright Dennis Potter in the MacTaggart Lecture at the 1993 Edinburgh Television Festival.[13]
Externally, Daleks resemble human-sized pepper pots[4] with a single mechanical eyestalk mounted on a rotating dome, a gun-mount containing an energy-weapon ("gunstick" or "death ray") resembling an egg-whisk, and a telescopic manipulator arm usually tipped by an appendage resembling a sink-plunger. Daleks have been known to use their plungers to interface with technology,[14] crush a man's skull by suction,[14] measure the intelligence of a subject,[15] and extract information from a man's mind.[16] Dalek casings are made of a bonded polycarbide material called "Dalekanium" by a member of the human resistance in The Dalek Invasion of Earth and the Dalek comics, as well as by the Cult of Skaro in "Daleks in Manhattan".[15][17]
The lower half of a Dalek's shell is covered with hemispherical protrusions, or 'Dalek-bumps', which are shown in the episode "Dalek" to be spheres embedded in the casing.[14] Both the BBC-licensed Dalek Book (1964) and The Doctor Who Technical Manual (1983) describe these items as being part of a sensory array,[18] while in the 2005 series episode "Dalek" they are integral to a Dalek's forcefield mechanism,[14] which evaporates most bullets and resists most types of energy weapons. The forcefield seems to be concentrated around the Dalek's midsection (where the mutant is located), as normally ineffective firepower can be concentrated on the eyestalk to blind a Dalek. In 2019 episode "Resolution" the bumps give way to reveal missile launchers capable of wiping out a military tank with ease. Daleks have a very limited visual field, with no peripheral sight at all, and are relatively easy to hide from in fairly exposed places.[19] Their own energy weapons are capable of destroying them.[20] Their weapons fire a beam that has electrical tendencies, is capable of propagating through water, and may be a form of plasma or electrolaser. The eyepiece is a Dalek's most vulnerable spot; impairing its vision often leads to a blind, panicked firing of its weapon while exclaiming "My vision is impaired; I cannot see!" Russell T Davies subverted the catchphrase in his 2008 episode "The Stolen Earth", in which a Dalek vaporises a paintball that has blocked its vision while proclaiming, "My vision is not impaired!"[21][22]
The creature inside the mechanical casing is soft and repulsive in appearance, and vicious in temperament. The first-ever glimpse of a Dalek mutant, in The Daleks, was a claw peeking out from under a Thal cloak after it had been removed from its casing.[23] The mutants' actual appearance has varied, but often adheres to the Doctor's description of the species in Remembrance of the Daleks as "little green blobs in bonded polycarbide armour".[24] In Resurrection of the Daleks a Dalek creature, separated from its casing, attacks and severely injures a human soldier;[25] in Remembrance of the Daleks there are two Dalek factions (Imperial and Renegade), and the creatures inside have a different appearance in each case, one resembling the amorphous creature from Resurrection, the other the crab-like creature from the original Dalek serial. As the creature inside is rarely seen on screen there is a common misconception that Daleks are wholly mechanical robots.[26] In the new series Daleks are retconned to be squid-like in appearance, with small tentacles, one or two eyes, and an exposed brain.[14] In the new series, a Dalek creature separated from its casing is shown capable of inserting a tentacle into the back of a human's neck and controlling them.[27]
Daleks' voices are electronic; when out of its casing the mutant is only able to squeak.[25] Once the mutant is removed the casing itself can be entered and operated by humanoids; for example, in The Daleks, Ian Chesterton (William Russell) enters a Dalek shell to masquerade as a guard as part of an escape plan.[23]
For many years it was assumed that, due to their design and gliding motion, Daleks were unable to climb stairs, and that this provided a simple way of escaping them. A cartoon from Punch pictured a group of Daleks at the foot of a flight of stairs with the caption, "Well, this certainly buggers our plan to conquer the Universe".[28] In a scene from the serial Destiny of the Daleks, the Doctor and companions escape from Dalek pursuers by climbing into a ceiling duct. The Fourth Doctor calls down, "If you're supposed to be the superior race of the universe, why don't you try climbing after us?"[29] The Daleks generally make up for their lack of mobility with overwhelming firepower; a joke among Doctor Who fans is that "Real Daleks don't climb stairs; they level the building."[30] Dalek mobility has improved over the history of the series: in their first appearance, in The Daleks, they were capable of movement only on the conductive metal floors of their city; in The Dalek Invasion of Earth a Dalek emerges from the waters of the River Thames, indicating not only that they had become freely mobile, but that they are amphibious;[31] Planet of the Daleks showed that they could ascend a vertical shaft by means of an external anti-gravity mat placed on the floor; Revelation of the Daleks showed Davros in his life-support chair and one of his Daleks hovering and Remembrance of the Daleks depicted them as capable of hovering up a flight of stairs.[32] Despite this, journalists covering the series frequently refer to the Daleks' supposed inability to climb stairs; characters escaping up a flight of stairs in the 2005 episode "Dalek" made the same joke and were shocked when the Dalek began to hover up the stairs after uttering the phrase "ELEVATE", in a similar manner to their normal phrase "EXTERMINATE".[14] The new series depicts the Daleks as fully capable of flight, even space flight.[19]
The non-humanoid shape of the Dalek did much to enhance the creatures' sense of menace.[33] A lack of familiar reference points differentiated them from the traditional "bug-eyed monster" of science fiction, which Doctor Who creator Sydney Newman had wanted the show to avoid.[34] The unsettling Dalek form, coupled with their alien voices, made many believe that the props were wholly mechanical and operated by remote control.[35]
The Daleks were actually controlled from inside by short operators,[36] who had to manipulate their eyestalks, domes and arms, as well as flashing the lights on their heads in sync with the actors supplying their voices. The Dalek cases were built in two pieces; an operator would step into the lower section and then the top would be secured. The operators looked out between the cylindrical louvres just beneath the dome, which were lined with mesh to conceal their faces.[36]
In addition to being hot and cramped, the Dalek casings also muffled external sounds, making it difficult for operators to hear the director or dialogue. John Scott Martin, a Dalek operator from the original series, said that Dalek operation was a challenge: "You had to have about six hands: one to do the eyestalk, one to do the lights, one for the gun, another for the smoke canister underneath, yet another for the sink plunger. If you were related to an octopus then it helped."[37]
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