Script written by Dan Aykroyd in which the team has to travel to hell to find out why Satan has been evicting spirits from his realm, forcing them back to earth. Notable for the inclusion of several new Ghostbusters, and the exclusion (outside of a cameo at the end) of Bill Murray's character. Given the setting, and the fact that parts 1 and 2 both had a giant creature in each (Stay-Puft Marshmallow Man and the living Statue of Liberty, respectively), it's okay to assume that this script would have featured at least some sort of giant spectres. You can read more about the project at http://filmforce.ign.com/articles/366/366119p1.html .