A rural Colombian village is attacked by a horrible sea serpent, aroused by industrial pollution of a nearby lake. Based on a real event that took place in June of 1971.

Wild-partying hippie-artist-dilettantes end up forming a revolutionary terrorist cell. The misfit Gato loses a lot of money in bets and his father throws him out of his house. Ál leaves his girlfriend Laura for his lover, the married Adriana. Out of money Gato and Ál becomes urban guerrilla when they plan to kidnap Gato's rich father.