Dionicio Castellanos Torres is a Mexican professional wrestler best known by the ring name Psicosis. He currently works for Asistencia Asesoría y Administración under the ring name Nicho el Millonario, as a new Psicosis took over the former name. Castellanos has performed for World Wrestling Entertainment, World Championship Wrestling, Extreme Championship Wrestling, Consejo Mundial de Lucha Libre, Total Nonstop Action Wrestling, and Xtreme Pro Wrestling as well as a variety of Mexican and American independent promotions. He was the shortest reigning WCW Cruiserweight Champion with a reign that lasted less than an hour.