In 2006, Calderón and both companies published "The Underdog/El Subestimado". He noted that the production includes influence from several Afro-Caribbean rhythms including reggae, salsa, bomba and rumba. This production featured the guests appearances of Buju Banton, Voltio, Bataklán, Eddie Dee, Luis Cabán, Yandel, Zion, Chyno Nyno, Don Omar and Oscar D'León. Several producers were involved in the album, including Cookee, Major League, Salaam Remi, Eric Figueroa, Luny Tunes, DJ Nelson, Danny Fornaris, Nesty La Mente Maestra, Naldo, DJ Joe, DJ Fat, Echo & Diesel.