While exploring the catacombs under Paris, the Ghostbusters are captured by an army of skeletons! In order to prove they’re the good guys, our heroes are “drafted” into an underground turf war with the fate of Paris hanging in the balance. But bones aren’t all that’s lurking deep within the Parisian underground… more black slime, and a mysterious villain who may be the key to everything await. Strap on your ecto-goggles and fire up your proton pack. There’s danger at every turn.