Crystal Dispenser

Crystal Dispensers, also referred to as Brothers, were male programed robotic dispensers which only dispensed crystals. They appeared in different colours which included green, red, yellow, blue, orange and purple. They could project holograms that showed which colour crystal was required to fire at. They were found aboard the SS Lucy Gray, though for anyone who wasn't an engineer aboard the ship they would lower into the floor and hide. (VG: Doctor Who: Return to Earth)

The dispensers also had female counterparts which were Object Dispensers also referred to as Sisters.