The Dark Crystal is a dark fantasy media franchise created by Jim Henson, centered on the alien planet of Thra and the conflict between the Gelfling, the Skeksis, and the urRu (Mystics).The film revolves around Jen and Kira, two Gelflings on a quest to restore balance to the world of Thra and overthrow the evil, ruling Skeksis by restoring a powerful broken Crystal.