征矢学
In May 2011, Ozz, Cuervo and Espíritu joined La Parka and Drago to form "technico" group "El Inframundo" ("The Underworld") and battle Cibernético's "Los Bizarros", which also included their former stable mate Escoria. Ozz and Cuervo returned to All Japan Pro Wrestling in September 2011 and, after Ozz pinned World Tag Team Champion KENSO in a six-man tag team match, were named the number one contenders to KENSO's and The Great Muta's title. On October 9 at Héroes Inmortales, La Parka turned "rudo" and jumped to "Los Perros del Mal". On October 23, Ozz and Cuervo defeated Muta and KENSO to win the World Tag Team Championship. Ozz and Cuervo returned to AAA on December 16 at Guerra de Titanes, along with Vampiro, who replaced La Parka as the leader of "El Inframundo". After returning to Japan, Ozz and Cuervo lost the World Tag Team Championship to Manabu Soya and Takao Omori in their fourth title defense on March 20, 2012.