SV7 was a Super-Voc taken over by Taren Capel.
Biography
SV7 was the Super-Voc which supervised the other robots aboard a Sandminer. Taren Capel took control of SV7 and he led the robots in killing the crew. Leela released helium into the air so that SV7 did not recognise Capel's voice and so killed him. The Doctor then deactivated it. (DW: The Robots of Death)
Behind the scenes
SV7 was released as an action figure in Wave 1 of Classic Series Character Options action figures.