The Real Ghostbusters (1986)

S02E32 The Collect Call of Cathulhu

After the Necronomicon mysteriously vanishes from the city library, the Ghostbusters are thrust into a chaotic adventure. They face off against bizarre creatures lurking in the sewers, pursue sinister cults, and delve into comic book lore for clues to aid their quest. As they unravel the mystery, the team must navigate through the dark underbelly of the city to retrieve the ancient tome and stop the impending chaos it could unleash.