This is what he's been working on all those years. - Building this model? - The detail is amazing. No, he came here to finish what the original ghostbusters started. - To trap gozer... - Out in that dirt field. Exactly. These big silos act as a capacitor. - What's a capacitor? - Would it kill you to read? Would it kill you to just tell me? Once activated, these towers can hold a charge for one moment. But in that one moment, they can power hundreds of traps. So how do we get gozer into the field? - Gozer's protected by two evil spirits. - The keymaster and the gatekeeper. She needs both of them. No gatekeeper, no gozer. First these spirits must possess two human souls. - Like mom. - So they can unite...