Calamari, a magician and escape-artist supreme, is being haunted by a ghost that cannot be captured in a Ghost Trap. To make matters worse, Peter has fallen through Calamari's secret cabinet into a strange dimension!

An Irish police officer in New York, the current head of his clan, is being pursued y a Bog Hound from the old country. The Ghostbusters must stop the Hound with the aid of a four-leaf clover, on St. Patrick's Day!

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.

A possessed geranium is given to the Ghostbusters as a gift, who in turn present it to Janine. The plant soon grows and begins to overthrow New York, but how do you "bust" a plant?

The ghost of Casey Jones returns and commandeers a locomotive for one last midnight ride. Despite his love for trains, a kidnapped Peter would rather be somewhere else in case history repeats itself and the train crashes!

A paranormal convention comes to town, but when the Ghostbusters are called into action, they are forbidden by the hotel's manager from using their technology for fear of disturbing another group… a convention for dentists!