Lok

Governor Lok was the robotic governor of the prison planet Volag-Noc.

Biography
While performing his duties, Lok was imprisoned in a gaol cell by Gurney who attached an inhibitor to the android, preventing him from escaping. The Tenth Doctor and Martha Jones came to the prison and the former freed Lok, who then led a rebellion against Gurney. Acting on his imperatives, Lok saw fit that the gaol should be purged, with all the prisoners to be killed. The Doctor dissuaded him from this course by reprogramming him. (DW: The Infinite Quest)