Egon goes to live with Eduardo, because the firehouse is being sprayed for bugs. While he's conducting mold experiments in Eddie's bathtub, the EGB's investigate a troll apperance in a local restarunt. The troll splits in two, but they manage to catch one and bring it back for anaylasis. However, Eduardo's brother, a district cop, is far from happy about him and his freind taking up room in the spare apartment. And he sure as heck let's Eddie know about it. Eddie's little cousin finds the troll filled trap, and releases it, while playing "ghostbuster". So, he decides to go after it, and redeem himself. Eddie's brother freaks out and wants no help from the Ghostbusters. But, he can't go looking after his son, because the bridges are infested with Trolls. While he goes off to deal with the trolls, police style, Eddie debates on whether to help or not... Even if it means losing his own brother..