Robo-Buster

Janine's rich new boyfriend, Paul Smart, steals a ghost trap and other technology to build a robot catching ghost, Robo-Buster. The Ghostbusters are being driven out of business by Robo-Buster, which seemingly destroys ghosts rather than trapping them. Turns out all those ghosts, including poor Slimer, have been made into one giant ghost because of this and they want revenge.