The android replica of Dr Roger Korby's assistant, who meets Kirk and Christine Chapel in the caverns of Exo III in 2266 and is destroyed when he threatens the captain.
Dr Brown appears in the first-season episode What Are Little Girls Made Of? The original Brown went to Exo III with Korby's expedition, missing for five years. The figure who greets the Enterprise party looks and sounds like him, although Chapel is puzzled that an old colleague is so slow to recognise her.
Shortly after one of Kirk's security guards has fallen to his death in a chasm, Brown brings the visitors to Korby. When Kirk tries to call his ship, Brown draws a weapon on him. Kirk fires first, and the wound exposes machinery where flesh should be.
Korby explains that the real Brown died and that this was one of the androids he built with the machines of the Old Ones. Brown was played by Harry Basch.