Neural control implant

Neural control implants were technology developed by the Sontarans as a form of mind control.

The device was inserted onto a subject through the back of the neck and emitted a flashing red light. After this the subject could be controlled physically and mentally without being aware of the implant at all. Commander Kaagh used neural implants on Professor Skinner and his daughter Lucy, the latter to activate as a fallback plan in case Sarah Jane tried to stop his plans. The device seemed to be in no need of surgical insertion as the Professor and his daughter were both fine after Sarah Jane switched the implants off with her sonic lipstick. (SJA: The Last Sontaran)

During the Sontaran invasion of Earth during the same time period, other Sontarans used hypnosis without implants.