story about six years ago, collected extraterrestrial life species of the U.S. national Aeronautics and Space Administration (NASA) probe crashed in Central America . Soon after , new life forms began to appear, and half of Mexico were classified as infected areas under quarantine . Until now, the military of the United States and Mexico are trying to control these "new species" ... in this context , an American journalist escort a frightened American tourist across the infected area in Mexico to return to the United States ......