The Bird of Kildarby

The Ghostbusters are called in by the Mayor of New York to evict a small army of ghosts from a recently purchased Irish Castle, set up in New York's Central Park, who will not allow anyone to enter. Peter goes to negotiate with the leader of the Castle, only to aggravate the ghost leader as only he can, who forces the Ghostbusters into a wager. If they can defeat the Bird of Kildarby, Lord Kildarby and his men will leave the castle, but if the monster bird defeats them, everyone in New York must leave Manhattan!