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The Kiseibya were parasitic creatures bred by Professor Shimura of the research facility Roark 279 on Bliss. The Professor bred them to be used as a weapon against the Daleks, combining the DNA of the Pirhanalocusts- dangerous flesh-eating insects- with silkworms to create metal-eating parasites, eating meat in their larval stage and laying their eggs in their 'food'. The Professor reasoned that this would allow them to 'eat' the Dalek casing and lay its eggs in the Dalek mutant. Shimura had intended to keep the Kisaabya contained until he could breed them to a point where they would be unable to consume human flesh, but the arrival of a Dalek attack force in the system apparently forced him to release the Kisaabya early so that they could feed and breed in his fellow scientists, reasoning that the scientists would die anyway when the Daleks arrived and their deaths would accomplish something this way.
Although the Kisaabya proved effective against the Daleks - Although vulnerable to most weapons, the speed of the Kisaabya’s gestation and reproduction, coupled with their ferocity in attack, helped to counter that weakness -, The Doctor was obviously unnerved by the similarities between Shimura and Davros’s research, both having created a new race to ‘save’ their own from a prolonged war, as well as both being unprepared for their creations’ unwillingness to obey them. Shimura protested that his creations would stop the Daleks and save mankind, but the fact that the name ‘Kisaabya’ means ‘parasitic saviour’ suggested to The Doctor that Shimura knew what he was doing was ethically conflicted from the beginning. As the Daleks invaded the facility, killing the Valkyrie unit, the Kisaabya attacked the Daleks, tearing through a Dalek platoon, leaving the Black Dalek - now infested with Kisaabya eggs - as the only survivor when The Doctor discovered it.
Recognising the horror of the Kisaabya when he realised that he actually felt sorry for the Black Dalek, and with the Valkyrie unit now dead, The Doctor, having confirmed that the Kisaabya’s Piranhalocust nature would drive them to expand when they could survive on Bliss, programmed the Black Dalek’s damaged casing to self-destruct - with the Dalek’s permission - while positioning it beside the base’s power cells. With the remaining Daleks on planet having ordered their ship to depart to prevent the Kisaabya spreading before exterminating themselves, The Doctor departed the base before the Black Dalek exploded, destroying the facility and the Kisaabya... the very atrocity that history recorded would take place(BFA: Enemy of the Daleks)