On March 12, 2006 he started wrestling in Asistencia Asesoría y Administración in Mexico as a character named Muerte Cibernetica. In November 2006, Cosme was involved in the tapings of the Wrestling Society X television series. He was the second and last wrestler to win the WSX Championship. Cosme returned to Puerto Rico and wrestled again with International Wrestling Association for a month. He then returned to Asistencia Asesoría y Administración in a special event presented by the company. At this time, he started using the name Mesias. In September 2007, the company held a tournament where all of the champions and first contenders wrestled. In the tournament, he won the GPCW Super-X Monster Championship and IWC World Heavyweight Championship. In the final match of the tournament, he became the first wrestler to win the AAA World Heavyweight Championship. While working in Mexico, Cosme signed a contract with Total Nonstop Action Wrestling (TNA) where he started wrestling on September 13, 2007 as Judas Mesias. Cosme wrestled for TNA until March 2008. He is currently wrestling in Lucha Underground under his ring name Mil Muertes. He debuted for Lucha Underground on the episode, which aired on November 6, 2014.