The film covers several significant events. The events include the creation of the world, the creation of humans, the creation of animals, and the consequences that ensue.
The creation of humans begins with a few failed attempts. The gods, Heart of Sky and Heart of Earth, first create a race of beings that turn out to be respectful worshipers but are unable to reproduce and are destroyed by the gods as a result. The second group the gods make are made of wood without hearts or minds and they too are destroyed.
Throughout the film, various explanations are given as to why certain animals possess certain traits. We learn that the dark lords split owls mouths as punishment. The toad got its sloped back from being pushed on to forcibly spit out a louse. And rabbits lost their tails as a result of people trying to catch them.
We are also given an account of a very important ball game.
To learn more about the Mesoamerican ball game, check out this link: http://www.ancient.eu/article/604/ One day One Death and the lords of Xibalba, heard the sound of a rubber ball and sent owl to bring the ball players down to the Underworld to play against them. Two brothers, One Hunter and Seven Hunter, arrived to challenge the dark lords. The brothers were outwitted by the lords and were humiliated. The dark lords had the losers sacrificed.
The head of one of the Hunters hung in a tree that became alive and began to sprout. The tree was found by Blood Moon, daughter of a lord of Xibalba. She becomes impregnated with the sons of One Hunter and Seven Hunter. She then climbs to earth and gives birth to Hunter and Jaguar Deer, who grow up to avenge their fathers' deaths.
On their quest of revenge against lords of the Underworld, Hunter and Jaguar Deer are faced with the Trials of Xibalba. However, they are able to overcome each obstacle put in their way. Eventually the brothers play a rematch ball game against the Dark Lords, but this time the humans are able to defeat their opponents via trickery. Despite their victory, the Lords of the Underworld kill the willing human brothers, throwing their bodies into a river. The bodies of Hunter and Jaguar Deer regenerate themselves and ultimately come back to sacrifice One Death and Seven Death in a final triumph for the brothers.
A clip from the film: