Here's is my plot:
* The GBers (Ghostbusters) hire a man, little do they know that he is a “gateway” for Gozer, and her fiends, Mr. Sandman, the Great Pumpkin Phantom, and a witch who gets great enjoyment from turning people into dead trees.
* A spell is put on the entire city of New York. On the NFL, the possessed NY Giants defeat a helpless NY Jets team (sorry, Dad). Even the GBers get the spell… except Ray, who gets a personal visit from an old friend, and this time, it's up close and personal.
* Peter, Winston, Egon, and Slimer fight and even stage a pie fight in front of cheering ghosts and possessed people. (Evil enough for you Aykroyd?) This causes the Firehouse to shut down.
* In the meantime, Ray got kidnapped by Mr. Stay Puft (in his gigantic form) and is taken to the Marshmallow World. Ray is told about a legend that at first he doesn't believe.
* Peter gets dispossed by accidently falling into the Atlantic Ocean, and soon, is able to disposses both Winston and Egon. They try to blast all four ghosts with their packs, but fail miserably.
* Stay Puft convinces Ray to help him by allowing Stay Puft to assume his full form on Earth. Stay Puft creams Ray, which then protects Ray from any ghosts attacks.
* The GBers spot Gozer and her fiends meet… let's just say… the devil, the true form of the fake GBer, and hear them plot to take over Earth for good. They tell Ray, who is still covered in marshmallow, what the plot is.
* In the final battle, after cornering the four ghosts in a corner, they try to trap them. But Stay Puft sacrafices himself by crushing the ghosts to death, and therefore risking death himself. Ray cries in horror as this happens.
* Ray tells Stay Puft how he feels about him “I loved you from my childhood, I thought you can never, ever possibly destroy us.” This cures Stay Puft and Ray must decide to either say goodbye to his childhood hero or leave Earth forever.