Tijuana (Halloween, Damián 666), and Aguayo Jr. decided to start a new faction, Los Perros del Mal ("The Bad Dogs"). Soon, the group would consist of Aguayo Jr., La Familia, La Furia del Norte, Blue Demon Jr., Pierroth Jr. and Pierroth's storyline sons. The group took on many rivals, including Negro Casas, Felino, Heavy Metal (who had just jumped from AAA), Máscara Mágica, Universo 2000 and Aguayo's new focus, the rising star Místico, who had defeated him in a main event singles match. The two agreed to a hair vs. mask match, but no date was specified. Los Perros del Mal faced off against their rivals in the 2005 "Cage of Death" match, in which Damián 666 took the hair of Máscara Mágica. On May 5, 2006, Aguayo Jr. was defeated by Rayo de Jalisco Jr. and El Canek in a three-way match for the IWRG Intercontinental Heavyweight Championship in Nezahualcoyotl. Aguayo Jr.'s final major feud in CMLL was with Héctor Garza, which culminated in a Hair vs. Hair match on March 21, 2008, at Homenaje a Dos Leyendas, which Aguayo Jr. won via a low blow. Los Perros del Mal and return to AAA (2008–2015) Aguayo Jr. left CMLL in October 2008, along with fellow Los Perros Del Mal members Damián 666 and Mr. Águila, to start his own promotion called Perros del Mal Producciones. The new promotion's debut show took place on December 7, 2008, in Mexico City. On that show, Aguayo Jr. tag-teamed with Cibernético and Dr. Wagner Jr. to face L.A. Park, Olímpico and Headhunter A, and was victorious. On June 6, 2010, at Triplemanía XVIII, Aguayo returned to AAA to lead Perros del Mal in an invasion of the promotion. The group quickly aligned themselves with Konnan and Dorian Roldan's La Legión Extranjera, La Milicia and Los Maniacos to form La Sociedad. On August 14 at Verano de Escandalo El Hijo del Perro Aguayo wrestled his first major match for AAA since his return, when he, L.A. Park and Damián 666 defeated El Mesías, Cibernético and La Parka in a six-man tag team match, when Perro pinned Mesías. On October 1 at Héroes Inmortales IV El Mesías defeated Perro in a singles match. Afterwards, Aguayo injured his knee, sidelining him for the rest of the year. However, he made a surprise appearance on December 5, 2010 during the main event of Guerra de Titanes, helping