A cult film from the 1970s, lost for years and now newly restored, “Chac: The Rain God” is based on ritual and legends from the Popul Vuh. This gorgeous film, shot in the Chiapas region of Mexico by Chilean director Rolando Klein, focuses on a small Tzeltal village during a terrible drought. Desperate for relief, thirteen men set out on a quest to save their people from starvation with a Diviner who takes them far from their own land on a strange journey. “Chac” is magical, mystical and intensely visual. A dazzling portrait of a Native American spiritual quest, “Chac” is a visionary masterpiece as powerful and revolutionary as “Walkabout,” “El Topo” and “Aguirre: The Wrath of God.