Juan Contreras made his in-ring debut on February 11, 2000, after training under Consejo Mundial de Lucha Libre (CMLL) wrestling trainers Tony Salazar and Jose Luis Feliciano.
[3] Sangre Azteca soon became the leader of the group that besides El Koreano also included Ramstein, Hooligan, Nitro, Arkangel de la Muerte, Loco Max and Doctor X.
Order of elimination in the battle royal was: #1 El Texano Jr., #2 Nitro, #3 Apokalipsis, #4 Máximo, #5 Sangre Azteca, #6 La Máscara, #7 Misterioso Jr.
[4] A few weeks later, on July 29, 2005, Apocalipsis was one of 8 wrestlers in a torneo cibernetico elimination match that was part of CMLL's G1 Junior Climax tournament.
[4] In the years following his character change Contreras, as Apocalipsis, worked primarily in the first and second match of the night, often playing the villainous foil to young tecnico wrestlers.
[6] After playing a supporting character in the "Veterans vs. Generacion 2011" storyline Apocalipsis continued to work as a low-card rudo worker whose primary purpose is to help rookie tecnicos gain in-ring experience.