He-Man/ThunderCats could destroy them both. He-Man fires his power into the Sword of Omens as together he and Lion-O summon the Power Beyond Power at Mummator. The resulting blast of energy overwhelms Mummator and blasts him apart into Skeletor and Mumm-Ra before disintegrating both beings. The resulting blast transforms He-Man back into Adam but seals the orb and both the Sorceress and Jaga claim victory for the heroes. Lion-O looks and sees a portal back to Thundara and is desperate to return and save his father and his world saying he won’t run away again. Adam gently holds his friend back
He-Man/ThunderCats Sorceress, who managed to get free while they traveled realities, summon the recovered heroes to support Lion-O and He-Man. Mummator starts to unlock the orb and the Power of Grayskull begins to flow into him. Even He-Man begins to weaken as his power is taken. Lion-O manages to slash Mummator's wrist and get the Power Sword back but it is too late to stop the orb from unlocking. Realizing they have one last chance He-Man and Lion-O risk combining the remaining power of Grayskull in He-Man and the Power Sword with the Sword of Omens even though both realized it