Erick Casas left CMLL when he decided to go to the newly created promotion Asistencia Asesoría y Administración, later known simply as AAA, in 1992. He changed his gimmick to Heavy Metal where he was a "rudo" and had a rock-star look which was based on heavy metal music. His first victory as Heavy Metal was the Mexican National Welterweight Championship, when he defeated Rey Misterio, Jr. in 1993. He retained his title against Rey Misterio twice and El Hijo Del Santo. Santo and Metal would rival over Santo's WWA Welterweight Championship and over Metal's Mexican National Welterweight Champion. Both wrestlers would put both of their titles on the line in the same match where winner takes all. Heavy Metal lost his title to Santo in the Fall of 1993 when both of them put both of their titles on the line. After the loss of the title, Metal turned into a "tecnico". He formed a team with Latin Lover where both of them feud with Rocco Valente, Tony Arce and Vulcano. Rocco Valente and Tony Arce was the Mexican National Tag Team Champion at the time. Heavy Metal and Latin Lover had a shot for the title and won the title in 1994. After Metal and Lover won the title, Arce challenged Metal in a luchas de apuestas (bet match) match which Metal accepted. The match took place just after two weeks when Metal and Lover won the title. Metal was able to beat Arce and so Arce hair was shaved.