The Dreamstone (1990)

S2E1 The Nightmare Stone

Following his loss in "Megaattack," Zordrack tumbles onto a barren asteroid, where he discovers a powerful energy crystal that induces terrifying nightmares. He dubs this crystal the Nightmare Stone and heads back to the realm of nightmares. With devious intent, he plots to swap the Dreamstone for the Nightmare Stone within the Dream Maker's tower, aiming to plunge the noops and everyone else into a perpetual state of horrifying dreams.