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Genocide was the destruction or attempted destruction of either an entire species or specific group of people. It can be contrasted with murder, which involved the killing of individuals rather than entire populations.
By the sixth incarnation of the Doctor, on Gallifrey article 7 prohibited any form of genocide for the Time Lords. (TV: Terror of the Vervoids) The Doctor seemed to be vehemently opposed to genocide, especially if there was an alternative to ending the conflict; his tenth incarnation claimed that, if one looked up the word "genocide" in a dictionary, they would see a picture of him with the caption "over my dead body", (TV: The Doctor's Daughter) while the eleventh insisted that genocide was never a solution, even in a seemingly endless war like that between the Sontarans and the Rutans. (GAME: The Gunpowder Plot) However, he himself resorted to it, intentionally or otherwise, on several occasions.
Human genocides Edit
The Fourth Doctor helped human scientists kill the last of the Pescaton by the application of high-frequency sound waves. The Pescatons had fled their dying homeworld in search of another planet with large areas of salt water that could support them. (AUDIO: Doctor Who and the Pescatons)
Dalek genocides Edit
As the Daleks believed in racial purity and their superiority, they were responsible for many acts of genocide during their history. Races they destroyed included: Koral's species (PROSE: Prisoner of the Daleks) and Eve's species. (TV: The Mad Woman in the Attic)
Dalek Caan committed genocide by killing all the Dalek-humans when they refused to obey the Daleks. When the Doctor confronted him, he offered help as he had already seen one genocide and had no wish to cause another. (TV: Evolution of the Daleks)
Doctor genocides Edit
The Fourth Doctor destroyed Sutekh, the last known Osiran. He even taunted Sutekh as he died in the "temporal trap", asking him how long Osirans live, before finally declaring, "The time of the Osirans is long past. Go." (TV: Pyramids of Mars) The Fifth Doctor twice encountered other living Osirans, but was forced each time to destroy them as well. (PROSE: The Sands of Time, AUDIO: The Bride of Peladon)
The Fourth Doctor tripped Eldrad, the last Kastrian, causing him to fall into a pit. Although the fall appeared to be fatal, the Doctor doubted he had really been killed. (TV: The Hand of Fear) He later encountered another surviving Kastrian, Mulkris, assigned to ensure that Eldrad's death sentence was carried out. (AUDIO: Eldrad Must Die!)
With Leela's help, the Fourth Doctor destroyed the last of the Fendahl. He dropped the remains of the Fendahl into a supernova to ensure their permanent destruction. (TV: Image of the Fendahl) However, this attempt appeared to have failed, as the Fendahl later managed to re-manifest in Kaldor City, (AUDIO: Checkmate) and the Eighth Doctor discovered that the Fendahl he defeated was only a fragment of the true Fendahl that remained trapped on Planet 5 (although the true Fendahl was consumed by the Fendahl Predator). (PROSE: The Taking of Planet 5)
The Fourth Doctor may be arguably responsible for the death of Ligeia Bassett, the self-proclaimed last of the Valjax, as he destroyed the equipment that she was using to keep herself alive after her people were struck by a lethal plague, with Ligeia only keeping herself alive by transferring herself into the bodies of human women, this process resulting in accelerated aging and only serving as a temporary stop-gap measure (AUDIO: The Auntie Matter).
When the Sixth Doctor was forced to wipe out the Vervoids to stop them killing the humans on Hyperion III. This was used against him in a trial occurring in his own past. When the Valeyard accused him of genocide, the Doctor said that he had no other option. (TV: Terror of the Vervoids) When the Eighth Doctor travelled to the events of the trial and met his sixth incarnation, he dismissed the charge due to the artificial nature of the Vervoids' creation. (PROSE: The Eight Doctors)
The War Doctor was about to commit double genocide when he planned to destroy the Time Lords and most of the Daleks at the end of the Last Great Time War with the Moment. It was apparently Rassilon's Ultimate Sanction, which threatened the whole universe, that convinced him he had no other choice. He believed to have committed it until the final part of his eleventh incarnation. (TV: Dalek, The End of Time et al.) Actually, with the help of the Tenth and Eleventh Doctors, he found a different solution and with the help of "all thirteen" incarnations of himself, froze Gallifrey and the Time Lords in a pocket universe while the Daleks destroyed themselves. He forgot about these events because the timelines of the different incarnations were out of sync. (TV: The Day of the Doctor)
During the Dark Times, the Fledgling Empires all but wiped out the Racnoss to prevent their devouring of planets. The Tenth Doctor later made them extinct when he flooded a ship of surviving young within the Earth. He was unknowingly aided by the Master, who ordered the destruction of the Webstar which resulted in the death of the Empress of the Racnoss. (TV: The Runaway Bride)
The Saturnyns were wiped out, with the Eleventh Doctor's help, in their attempt to take over Venice and convert female humans into new mates for their males. The converts were killed in an explosion, leaving the males to die out. The last female, Rosanna Calvierri, offered herself as a last meal to them, after telling the Doctor she hoped that their extinction would haunt his conscience. (TV: The Vampires of Venice)
Other genocides Edit
By the time of the Thousand Year War between the Kaleds and the Thals on Skaro, the Kaleds had wiped out the Dals and the Tharons, the two other sentient humanoid races who had evolved on the planet. (AUDIO: Purity)
After the death of all his species, Androvax went on a vengeful vendetta, destroying twelve planets before finally being arrested by the Judoon when he attempted to destroy Earth. (TV: Prisoner of the Judoon)
The Eleventh Doctor considered the complete destruction of the Cybermen at the hands of the Borg in the Federation universe genocide, although Captain Jean-Luc Picard did not share his grief. (COMIC: Assimilation²)
Planned genocides Edit
The Archaeons planned to purge the Earth of the life they had "seeded" since, due to the First Doctor disrupting their experiment, it had become disorderly and "run rampant", no longer matching their carefully-planned vision. They were stopped when humanity retaliated with missiles, destroying them. (AUDIO: The Beginning)
Qar, the leader of an unnamed planet, planned to massacre the Tryods so that her people could exploit the mineral wealth of the lands on which the Tryods lived. The massacre was prevented by Asiries, who was convinced to do so by the Second Doctor. (PROSE: The Word of Asiries)
The Bannermen attempted to bring about the extinction of the Chimerons. Only Delta escaped, along with an egg. After Billy converted into a Chimeron, the species was able to continue. (TV: Delta and the Bannermen)
Rivesh Mantilax invented a genetic weapon that would allow him to destroy the entire Viperox race. The Tenth Doctor stopped him from using it, insisting that no one had the right to wipe out a whole species. However, he did modify the device to merely impede the Viperox, halting an attempted invasion of Earth and driving Lord Azlok and the aggressors back to Viperon. (TV: Dreamland)
Rassilon attempted to deploy the Tear of Isha into the Tantalus Eye, killing all life in the inhabited worlds of the Tantalus Spiral, but that plan was stopped by the War Doctor. (PROSE: Engines of War)
Charlie Smith, the Prince of the Rhodian, believed that he could one day use the Cabinet of Souls to resurrect his fallen race after they were wiped out by the Shadow Kin. According to Charlie, the cabinet could use the souls of the Rhodian to burn and destroy the souls of a whole other race, but in the hands of a "hero" the souls of the Rhodian would transfer themselves into the bodies of the other race as well as burning their souls. Charlie admitted to Matteusz that either of these acts would cause the destruction of another race. (TV: Co-Owner of a Lonely Heart)