US merchant sailor Alex Walker is stranded in Mexico, penniless and wanted by the police. He meets and joins up with an unlikely couple - ageing but likeable shit Phillip Mills and young sexy, frustated wife Missy. The three develop a curiously inter-dependent relationship. Meanwhile, Police Captain Diaz and Detective Ortega are closing in and the plot circle is closed at Tapachula rail station amidst a stack of mistakes and wrong decisions.

A group of teenage, treasure seeking, grave robbers accidentally uncover the tomb of a satanic sect leader from the early Spanish colonial age, reawakening the diabolical killer, who promptly sets out to complete his unholy mission of spawning the son of Satan.