Following a month of performing in the International Wrestling Association, Cosme returned to AAA in a special event presented by the company, this time under the ring name of El Mesías. In September 2007, the company organized a unification tournament where all of the champions and first contenders participated. Over the course of the tournament, he won the GPCW Super-X Monster Championship and IWC World Heavyweight Championship, and on the tournament's finale, he became the first wrestler to win the AAA Mega Championship. While working in Mexico, Cosme signed a contract with Total Nonstop Action Wrestling (TNA) where he debuted as Judas Mesias on September 13, 2007. In March 2008 his association with TNA came to an end and he focused most of his time on AAA. In 2010 Cosme debuted for Puerto Rican World Wrestling Council, where he won the Universal Heavyweight Championship. He also wrestled in Lucha Underground under the ring name Mil Muertes.
Outside of his work within these promotions, Cosme has represented Puerto Rico as a member of Team Rest of the World in the 2015 Lucha Libre World Cup and as the captain of Team International in the 2013 World Cup of Wrestling.
Cosme began wrestling training in 1996, when he was instructed by a former wrestler. During this time, he was enrolled in the Interamerican University of Puerto Rico located in Bayamón, his major concentration was in computer technology, after completing two years of study, he decided to begin wrestling as a profession after meeting Víctor Quiñones in the gym. In 1997, after working in the independent circuit he moved to Mexico and performed there and became involved in a project to develop Hispanic talent organized by the World Wrestling Federation.

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