An ancient prophecy foretells that the Moon Juju, the kind protector of the Pupanunu people, would be weakened by the evil Tlaloc, an embittered Pupanunu shaman, so he could turn the Pupanunu people into sheep as revenge for not being made high shaman in favor of another shaman, Jibolba. The prophecy also mentions a great and mighty warrior who would restore the Moon Juju, defeat Tlaloc, and bring peace to the Pupanunu people.
Having escaped Tlaloc's spell, Jibolba believes his apprentice Lok to be the warrior of the prophecy and prepares to send him off; however, it appears that Lok has been turned into a sheep. Jibolba sends his younger apprentice, Tak (voiced by Jason Marsden), to find magical plants and change him back, though it turns out not to be Lok. Jibolba tells Tak to obtain the Spirit Rattle, which allows the wielder to communicate with powerful Juju spirits to assist him, while he finds Lok.
Tak returns with the Rattle to find that Lok has been trampled to ...