Genesis of the Daleks is the fourth serial of the twelfth season of the British science fiction television series Doctor Who. It was written by Terry Nation and directed by David Maloney, and originally broadcast in six weekly parts from 8 March to 12 April 1975 on BBC1. In the serial, the alien time traveller the Fourth Doctor and his human travelling companions Sarah Jane Smith and Harry Sullivan are directed by the Time Lords to the planet Skaro at the time of the Daleks' creation to prevent them from becoming the dominant race in the universe.

Genesis of the Daleks was originally commissioned under producer Barry Letts and script editor Terrance Dicks, who had asked Nation to write another Dalek story, but believed that the outline submitted was too similar to his previous Dalek adventures and encouraged him to explore their origins. The story introduces the Daleks' creator, Davros, who had a unique visual design. Letts and Dicks handed the original script to their successors, producer Philip Hinchcliffe and script editor Robert Holmes, who made changes which gave it a darker tone. Nation, having intentionally modelled the Daleks on the Nazis, further explored the theme in Genesis. It also addresses the moral issues that come with time travel and genocide.

The story was filmed over January and February 1975, with some location filming in a quarry in Betchworth. Genesis of the Daleks premiered with 10.7 million viewers and concluded five weeks later with 9.1 million, with the least-watched episode being Part Three with 8.5 million viewers. Since its broadcast the serial has been widely praised as one of the series' best.

Plot The Doctor and his companions are intercepted by the Time Lords, who instruct the Doctor to interfere with the creation of the Daleks. The Doctor is given a Time Ring which will return him and his companions to the TARDIS when the mission is complete.

The three find themselves on the planet of Skaro. A generations-long war between the Thals and the Kaleds has left the planet inhospitable; except for their two domes. An attack separates them; Sarah meets the Mutos, mutated exiles of both sides, but then are all captured by the Thals. The Doctor and Harry are captured by the Kaleds, their possessions confiscated, and are taken to a bunker to meet the scientific and military elite, including the lead scientist Davros, who unveils the "Mark III travel machine", or "Dalek". Ronson, one of the scientists, secretly tells the Doctor that Davros' experiments are unethical, and the Doctor convinces the leadership to halt them. Learning of Ronson's actions, Davros covertly provides the Thal leaders a chemical formula that can weaken the Kaled dome.

The Doctor and Harry reach the Thal dome and rescue Sarah. A missile strikes the Kaled dome, killing all those not in the bunker; it is revealed that Davros gave the details to the Thals so that he could dispose of those Kaleds who opposed him. Davros accuses Ronson of being the traitor, orders the Daleks to kill him, and convinces the leadership to have his Daleks attack the Thals. The attack kills many Thals; the Doctor, his companions, and the survivors make their way to the bunker and the Doctor instructs them to find a way to destroy it while he and his companions go inside.

Davros captures the Doctor; the other scientists, now aware of his plans, free the Doctor, who then rigs the Dalek incubation room with explosives. As he is about to touch the two exposed wire ends to set them off, he hesitates, questioning whether he has the right to make that decision.

He is relieved to learn that Davros has agreed to allow a vote on the project. The Doctor recovers the Time Ring; as the vote is called, the Daleks return and exterminate the remaining Kaleds. Harry and Sarah escape, while the Doctor returns to set off the explosives, but a Dalek inadvertently sets it off itself. The Doctor escapes before the Thal and Mutos' bomb caves in the bunker, trapping Davros and the Daleks, who then refuse to take orders from a non-Dalek and seemingly exterminate Davros. While he suspects he has only managed to set back Dalek evolution somewhat, the Doctor considers his mission complete: out of the Daleks' evil, good will always arise to challenge them. He and his companions say goodbye to the survivors and use the Time Ring to return to the TARDIS.

Production Conception and writing When planning stories for season 12, producer Barry Letts and script editor Terrance Dicks felt that it was time for Terry Nation to return to the series and write another Dalek adventure. Letts and Dicks enjoyed the script Nation sent in, but found it too "reminiscent" of many of his previous Dalek stories. The two suggested that Nation instead write an origin story for the Daleks, originally titled Daleks – Genesis of Terror. The serial was commissioned on 1 April 1974, and the scripts accepted on 22 July. The stories lined up for the season were handed over to Letts and Dicks' successors, producer Philip Hinchcliffe and script editor Robert Holmes, with whom Genesis of the Daleks gained a darker tone. Holmes was not keen on frequent appearances by the Daleks, and only allowed the story because it explored their origins. In an aim to make the series more adult, Hinchcliffe wanted the story to be "pacy" and make the Daleks appear more powerful. In a 2006 interview, Dicks said that he does not believe the story would have been much different if he and Letts had been in charge, though he remarked he would have added some lighter moments to soften the "grim" tone. Director David Maloney stated that the images of war at the beginning of the serial were intended to create atmosphere, and he had no intention of losing the younger audience.

The production of Genesis of the Daleks saw several changes from the script. Maloney altered the opening scene to show the soldiers gunned down by machine guns in slow motion. Nation was displeased with the change, and Maloney later felt that the violent addition was "a bit much". Hinchcliffe and Maloney were not keen on the Doctor's original meeting with the Time Lord, which took place in a lush garden, and changed it to the Skaro war-zone which they felt more appropriate. The Thal soldiers were originally supposed to be boys aged 15 or 16 to illustrate the youth of those fighting in the war, but this was later changed to make them appear more mature. In the Genesis of Terror script, Sarah Jane becomes ill in the third episode from radiation poisoning, and Bettan was a male who was introduced in the fourth episode. Part Five originally had more action in the Dalek incubator room and ended with the Doctor's question of whether he had the right to destroy them.

Casting and costumes

Maloney cast John Franklyn-Robbins as the Time Lord because he had worked with him before and intended his character to resemble Death in The Seventh Seal. Hilary Minster, who played a Thal soldier, had also played a Thal in Planet of the Daleks (1973). Minster had been considered for the role of Mogran. Peter Miles previously played Dr. Lawrence in Doctor Who and the Silurians (1970) and Professor Whitaker in Invasion of the Dinosaurs (1974). Stephen Yardley, who played the Muto Sevrin, later appeared in Vengeance on Varos (1985). During filming of Genesis, Yardley walked into the casting department on his lunch break in costume and asked for a job; because of his costume, they assumed he was a tramp from the street. Dennis Chinnery, who played Gharman, had previously been seen in The Chase (1965) and would later appear in The Twin Dilemma (1984).

The character of Davros was designed by Nation to have created the Daleks in his image, and to also be a "spokesperson" for the Daleks as he felt it was "boring" listening to Daleks giving speeches. The design was inspired by the Mekon, a comic book character with a small body and a large "green, dome-like head" which Hinchcliffe remembered from his childhood. Davros attracted the attention of BBC prosthetics designer John Friedlander who agreed to come off another show to make Davros' mask. The latex mask was moulded to Michael Wisher's face by make-up artist Sylvia James. Wisher could even eat while wearing the mask. Regular latex instead of the more mouldable foam latex was used because the latter was too expensive. The cast and crew regarded Davros' effects as a great technical achievement considering the budget and time period they worked in. Two children visiting Baker at the BBC studios were scared by Wisher in costume; they thought he was a statue at first. When sitting in Davros' Dalek-like base, Wisher wore knee pads and a kilt because trousers were too uncomfortable. To prepare during rehearsals, Wisher acted in a wheelchair with a paper bag over his head that only had slits cut out for his eyes so he would be used to the "disorienting" situation and be able to express himself without using his whole face. Wisher, a heavy smoker, put two holes in the top of the bag so he could smoke underneath it in rehearsals. Wisher also provided some of the voices for the Daleks with Roy Skelton; in some scenes, he was acting to his own pre-recorded dialogue. Stuntman and actor Terry Walsh appeared uncredited in several roles.

Filming and effects Genesis of the Daleks was the last serial of the twelfth season to be filmed, after Revenge of the Cybermen. As Sarah Jane had been filmed in Revenge wearing a combat costume, it was added into Genesis that the Doctor would hand her the outfit, into which she changes by the next scene. The story was mainly filmed in January 1975, with some studio recording carried into February. Location filming for the serial took place at Betchworth quarry in Surrey, which represented the landscape of Skaro. Having had trouble with the Daleks on location in Planet of the Daleks (1973), Maloney scheduled shooting so that they only appeared in studio scenes. The three active Dalek props used in the serial were originals from the 1960s, and their wear was covered by new paint. Five "dummy" Daleks which could not be operated were also used. Hinchcliffe wanted the Daleks to appear more powerful, and intended to achieve this through low angles and lighting. Duncan Brown, who was responsible for studio lighting, used colours and dark lighting to make the Daleks seem as if they were "emerging from the shadows" and to suggest rather than show the world created to viewers.

The same model was used for both the Kaled and the Thal domes. The gas attack in Part One was achieved through dry ice and green lighting. Some of the Thal guns were reused props from the First Doctor (William Hartnell) serial Galaxy 4 (1965). The electric trolley used by the Kaleds in Part One worked in tests, but collapsed when Baker and Marter boarded it. The creature Harry and the Doctor glimpse at the end of Part Two was mainly a reused Ice Warrior costume, while the Thal rocket ship was a reused model from The Ambassadors of Death (1970). During the filming of Part Two, Miles and Chinnery had trouble fitting the gun on the Dalek. As a result, the scene had to be filmed in two takes, bridged with a reaction shot of the Doctor. Part Two is unusual in that it is one of the very few episodes not to begin with a reprise, and also the first to end in a freeze frame. A stunt double for Elisabeth Sladen was hired for Sarah's fall from the scaffolding, but Maloney discovered that she would be falling eight feet, while Sladen had fallen ten feet in rehearsals. Maloney ultimately decided to conclude the episode with a freeze frame ending. Maloney would use the freeze frame technique again, most notably with The Deadly Assassin. The third episode overran its 25-minute limit and rather than cut material out the cliffhanger was changed from Davros' speech to the Doctor being electrocuted. The music for the serial was recorded on 3 March 1975 and the dubbing finished the day before Part One aired.