On this day in 1986, voice recording took place for The Real Ghostbusters episode “Apocalypse - - What, Now?” In this classic episode, the Codex of St. Theophilus, a book missing from an abbey in Greece since the 1600s, turns up at a New York auction and is accidentally purchased by Peter. Unbeknownst to the Ghostbusters, the sealed volume contains the Four Horsemen of the Apocalypse. #ghostbusters #therealghostbusters #cartoon #animated #onthisday