The Ghostbusters are down on their luck due to lack of ghost activity, when suddenly several calls begin to pour in from around the city, including the eventual reappearance of the Stay Puft Marshmallow Man (although dialogue indicates it is not the same one from the movie). After each case, a piece of a stone tablet is collected. The three Ghostbusters piece together the mysterious tablet, inadvertently opening a portal to "the evil world" and releasing a horde of ghosts. In the end, though, the Ghostbusters manage to defeat Janna, the God of Darkness, and retrieve a mystical gem from the evil world. They combine the gem with the tablet to close the portal, and save the city.