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An agreement between Cosme and the World Wrestling Council was first rumored on November 26, 2009. The promotion made the official announcement two days later, including highlights of his career in a compilation video displayed during a special event titled Crossfire. His debut was scheduled for January 16, 2010, being booked as Ricky Banderas in a contest against Carly Colón. Ray González was subsequently included, winning a three-way-contest where the WWC's first winner of the "Wrestler of the Decade Cup" was to be decided. The following week, both were booked in a rematch, with Banderas winning the cup. On July 11, 2010, Banderas was booked to act as special referee at Aniversario 2010, but was subsequently included in a stipulation match against Colón. His character made a heel turn in this event, attacking both Colón and Hugo Savinovich. On January 8, 2011, Banderas defeated Colón, with help from an interfering Shane Sewell, to win the WWC Universal Heavyweight Championship for the first time. Cosme was stripped of the title upon returning to the IWA, headlining an angle that revisited the promotion's first decade. His sole match took place on April 2, 2011, where he defeated González, who had since returned to his masked "Rey Fénix" persona, in the main event of the evening. Following this match Cosme's involvement in the IWA concluded, remaining inactive in Puerto Rico until January 7, 2012, when he reappeared in WWC programming asking for an opportunity to challenge Carly Colón for the Universal Heavyweight Championship. The challenge was accepted and took place at Euphoria 2012, but was inconclusive after Savio Vega interrupted by distracting Colón, which drained what was left of the preestablished time.