Lok

Governor Lok was the robotic governor of the Volag-Noc prison planet until Gurney used a hacking system to take over the jail. He locked up Lok. The Doctor and Martha Jones came to the prison, with the Doctor freeing Lok, who then rebelled against Gurney. Lok decided that all prisoners must be killed, but he was stopped by the Doctor. Lok, then seemingly died. (DW: The Infinite Quest)


 * It is not clear whether Lok deactivated permanently or only temporarily.