Robot police (Happy as Queeg)

Queeg used robot police to mentally monitor and control the populace of Krill. The robots emitted Truth beams from their heads to scan all minds, and arrested deviant minds to be reconditioned in Slave Brain Cubicles. When the Second Doctor visited Krill, the robots immediately arrested him and tried to brainwash him into being a citizen named "Hegg". The Doctor and friends then defeated Queeg. (PROSE: Happy as Queeg)

One of these robots was among the aliens stuck on Denossus when it was transported to the Time Vortex by the Vortexians. They would remain trapped for over twenty years until the Vortexians were expelled by the Doctor. (COMIC: Land of the Blind)