A corrupt CIA agent Sands hires hitman El Mariachi to assassinate a Mexican general hired by a drug kingpin attempting a coup d'état of the President of Mexico.
Once Upon a Time in Mexico is a 2003 American neo-Western action film written, directed, produced, photographed, scored, and edited by Robert Rodriguez. It is the sequel to Desperado (1995) and the third and final installment in the Mexico Trilogy. The film features Antonio Banderas in his second and final performance as El Mariachi. In the film, El Mariachi is recruited by CIA agent Sheldon Sands to kill a corrupt general responsible for the death of his wife, Carolina.