The Real Ghostbusters (1986)
S2E48 Apocalypse -- What, Now?
Episode 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.
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S2