Jimena Valentina Guevara Barón, better known as Jimena Barón or J Mena, is an Argentine actress and singer.

Los únicos is a 2011 Argentine superhero live-action television series aired by El Trece in the prime time. The "uniques" are a superhero team working as a covert operation unit. Main actors are Arnaldo André, Mariano Martínez and Griselda Siciliani, the two main supervillains are played by Favio Posca and Carlos Belloso.