Over the summer of 2004 Los Vipers, in this case Mosco, Histeria and Psicosis II became involved in a feud with Heavy Metal, El Intocable and Zorro that led to a Steel Cage match at Verano de Escandalo 2004 in which the last man in the cage would be unmasked or have his hair shaved off.
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Mosco de la Merced (Juan Valdez Valentino) is a Mexican Luchador or professional wrestler, best known for his time in Asistencia Asesoría y Administración (AAA) where he was a part of Los Vipers for many years.
When the new Psicosis joined Cibernético's recently formed Los Vipers group Mini Psicosis joined as well, teaming up with other Minis such as Mini Abismo Negro to form Los Mini Vipers, a group Sánchez would be associated with for the rest of his AAA career.
During mid-2004 Los Vipers, in this case Mosco, Histeria and Psicosis II became involved in a feud with Heavy Metal, El Intocable and Zorro that led to a Steel Cage match at Verano de Escandalo 2004 in which the last man in the cage would be unmasked or have his hair shaved off.