ghostbusting has now become commercialized. a new group calling themselves the better busters (someone help me with the name) has a larger group with younger members and better equipment. the classic guys are still together, with louis as the youngest and most agile. they're still in business but have been pushed out of the spotlight by the other guys. with all the new technology nowadays, the better busters created a way of communicating with the underworld, telling hades that if they created a portal to hell, he would supply them with enough ghosts and goblins to make a good amount of money. the containment unit of the betterbusters would secretly let the ghosts back into the underworld, more or less recycling the ghosts. but, in the end of the movie, hades uses the portal to come into NY and fuse it with hell. he releases all the demons in the underworld to aid him in the end of the world. the better busters find this out too late and go the the experts for help.