The Real Ghostbusters

Season 2, Episode 48

Episode Title: Apocalypse -- What, Now?

Air Date: 1987-11-18

Overview:

The Canon of St Theophilus, a book missing from an abbey in Greece since the 1860s, turns up at a New York auction and is accidentally purchased by Peter. Unbeknownst to the Ghostbusters, the sealed volume contains within it the Four Horsemen of the Apocalypse.