At the smart house, everyone's a little skittish: Allison because Jo is still living with Carter, Carter and Jo because Allison's skittish, Jenna and Kevin because Carter is cooking, and SARAH because… well, who knows, but something called "RF interference" is causing her to burn the toast.
Carter and Allison have a lovely day planned for the kids, but this being Eureka, it gets interrupted when a giant fireball is loosed in GD. Parrish had been developing what he calls a firefly, a collection of nanoparticles designed to extinguish fires, but when he gets into a fight with Zane, the firefly goes crazy and does the opposite of whatever Parrish directs it to do. Carter tries to catch it, but it escapes his clutches and flies away. The only chance they have of catching it is to follow it to whatever heat sources it might attempt to extinguish.
original airdate--May 07,2012 rating--1.45 million
song--Eureka Theme song--"Eureka On My Mind" by Bear McCreary
Welcome to Eureka, a seemingly normal small town somewhere in the Pacific Northwest. But you won't find it on any maps outside of the Pentagon. And if you're here you must be a genius. Because everyone else in town is.