NeuroBrain is the essential component located at Public Works that allows MetroNet to operate. It is cybernetic neural interface that allows the MetroNet computer to make decisions more efficiently than would a normal computer. This means that NeuroBrain requires a healthy human brain in order to function. Brains are transplanted into the neural receptacle while the donor is still alive. There were thirteen failed attempts at activating the system before Dr. Mallardo and Chip Chayken decided to use the latter's young, intelligent secretary, Diana Powers as the final and ultimately successful brain transplant.