Prison guard (The Forgotten)

Biology
Humanoid robots with a large light-emmiting eye.

Technology
The Guards used laser rifles that were carried in their hands at all times. They do not have the technology to scan for life signs, as they resort to physically touch The Doctor to look for a pulse.

History
They were used in the Last Great Time War to guard prisoners of various species including Time Lord, Sea Devil and Malmooth. They were also entrusted with guarding the Great Key.