The Dark Crystal: Age of Resistance (Tv Series) As the Gelfling race on the planet Thra become aware of the fact that their customarily worshiped overlords, the Skeksis, are exploitative, taxing essence-suckers who are destroying their world, three Gelflings-Rian, Brea and Deet—inspire a rebellion after discovering a horrifying secret behind the Skeksis' power that threatens their entire planet.