Toshio Shimura

Professor Toshio Shimura was a scientist who worked at the Roarke 279 Research Facility on the planet Bliss.

Biography
Toshio began experimenting with Piranha Locusts, crossing their genetic structure with silkworms to give them the ability to consume metal. He turned them into a more hostile species and dubbed his creations the Kiseibya. Shimura intended to keep the Kiseibya contained until he could breed them to be unable to consume human flesh, but the arrival of a Dalek attack force forced him to release the Kiseibya early so they could feed and breed in his fellow scientists. He reasoned the scientists would die anyway when the Daleks arrived and their deaths would accomplish something this way.

The Kiseibya proved effective against the Daleks. Although vulnerable to most weapons, the speed of their gestation and reproduction, coupled with their ferocity in attack, helped to counter that weakness. The Doctor was unnerved by the similarities between Shimura and Davros’s research. Both created a new race to "save" their own from a prolonged war. Both were unprepared for their creations’ unwillingness to obey them. Shimura insisted his creations would stop the Daleks and save mankind, but the the name "Kiseibya" meant "parasitic saviour". suggested to the Doctor that Shimura knew what he was doing was ethically conflicted from the beginning.

Toshio sacrificed himself to the original Kiseibya so he could live on through their children when he recognised his inability to control them. (BFA: Enemy of the Daleks)