The Real Ghostbusters

Apocalypse... What, Now? (2x48)

Air date: Nov 18, 1987

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.