Hercules and the Underworld Takeover

Hercules and the Underworld Takeover is an episode of Hercules: The Animated Series. It first aired on October 1, 1998

Summary
Hecate, demigoddess of magic and night, plots to take over the Underworld by planting a crystal on Hades' neck which slowly eats away his godly essence at the council of the gods, ousting Pain and Panic in the process. The two minions turn to Hercules for help, convincing him that "the devil you don't know is much worse than the devil you do know"- Hecate is worse than Hades, and he agrees to help restore him if they promise help in watching Amphitryon's sheep. Pain and Panic become attached to one who is about to give birth, while Hercules contends with Hecate for the throne, breaking the crystal. Hades, newly restored, blasts her out of the throne, and Amphitryon introduces Pain and Panic as the new sheep-sitters.