A rap/metal act from Spain, Def Con Dos started playing covers of Public Enemy and Beastie Boys while touring Madrid's club scene under the name of Freddy Krueger y los Masters del Universo. Soon they recorded a demo called Primer Asalto, signed up to local label Dro, and released Segundo Asalto in February of 1990. A good chance to leave the underground came when Def Con Dos, also known as DCD, had the opportunity to open for Run-D.M.C.