Genocide was the destruction or attempted destruction of either an entire species or specific group of people.
- For the novel of the same name, see Genocide (novel).
Human genocides
- When The Brigadier destroyed the Wenley Moor Silurian colony, the Third Doctor was disgusted by the act, considering it genocide. (DW: Doctor Who and the Silurians)
- Bennett believed he had wiped out the Didonians. However, at least two had survived. (DW: The Rescue)
- Humans may have committed genocide against the Wirrn in Andromeda when they destroyed their Breeding Colonies. (DW: The Ark in Space)
- 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. (AG: Doctor Who and the Pescatons)
Dalek genocides
- As the Daleks believed in racial purity and their superiority, they were responsible for many acts of genocide during their history. Races they have destroyed include the Dax (DYD: The Corinthian Project), Koral's species (NSA: Prisoner of the Daleks) and Eve's species. (SJA: The Mad Woman in the Attic)
- The Daleks wiped out the last Mechanoids on Magella. (DWF: Birth of a Legend)
- 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. (DW: Evolution of the Daleks)
Other genocides
- 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. (DW: The Runaway Bride)
- When the Sixth Doctor was forced to kill the Vervoids to stop them killing the humans on Hyperion III, this was used against him in a Trial occuring in his own past. When the Valeyard accused the Doctor of genocide, the Doctor said that he had no other option. (DW: 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. (EDA: The Eight Doctors)
- The Bannermen attempted to bring about the extinction of the Chimerons, only Delta escaped along with an egg. A human later converted into a Chimeron so the species could continue. (DW: Delta and the Bannermen)
- The Doctor committed genocide when he destroyed the Time Lords and most of the Daleks at the end of the Last Great Time War. (DW: The End of Time)
- The Doctor accused his Meta-Crisis duplicate of genocide when he destroyed all the Daleks in the Medusa Cascade, along with their fleet and the Crucible. As he thought he was too dangerous to be left to his own devices, he left him in Pete's World with Rose Tyler so she could make him better as she did for the Ninth Doctor himself. (DW: Journey's End)
- Rivesh Mantilax invented a genetic weapon that would allow him to destroy the entire Viperox race. The 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. (DW: Dreamland)
- 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. (SJA: Prisoner of the Judoon)
- Miss Myers, a member of a fleshkind race, created a child, intending for her to exterminate the metalkind. This plot was foiled by Sarah Jane Smith. (SJA: Sky)
- When the Weeping Angels arrived on Alfava Metraxis, they wiped out the Aplans. (DW: The Time of Angels)
