In the mirror universe, the Caretaker was the name given to the Nacene entity who assumed responsibility for the Ocampa. By the 24th century, the reason why the Caretaker protected the Ocampa had been lost to history. One legend stated that, centuries earlier, he had driven off invaders who had destroyed the surface of Ocampa V and had then built the underground city to protect them against further invasion while another stated that he was preparing the Ocampa for a great task which he had chosen them to perform.