The first part of Masters of the Universe: Revolution is five action-packed episodes that continue the story of He-Man and the heroes of Grayskull. Like Masters of the Universe: Revelation, the show tells a brand-new story by drawing from elements of the previous animated and live-action iterations. One such deep-cut is both a nod to the early 2000s animated series, and an abandoned storyline from the first generation of toys. The series picks up with what feels like an olive-branch to some disgruntled adult fans, as He-Man and Orko head to Subternia -- or He-Man Hell -- to rescue the souls of Fisto and Clamp Champ. This also lays the foundation for the larger, mystical arc taken by the Teela, who has ascended to being the Sorceress of Grayskull.
Source：https://www.cbr.com/masters-of-the-universe-revolution-keldor-explained/
