The documentary picks up a decade after Mercado mysteriously left the spotlight in the fall of 2006 and highlights the final years of his life as he prepared for one last performance. When he disappeared from the airwaves, fans had no idea where he went and even friends of Mercado's admit they didn't know what happened. Many in the film offer guesses: he didn't want to grow old on camera, that he was sick and living in an impenetrable fortress in Mexico, that he's an alien who went back to his home planet. The truth is not nearly as outrageous, but it doesn't make it any less sad.