As Allison heads off to a conference, she leaves her kids in Carter's care. He tries to take the weekend off, but of course nothing goes according to plan in Eureka and it's not long before he gets a call from Jo. It seems that Dr. Holly Marten, the representative who's checking out the unauthorized FTL trip, had Fargo all worked up and – POW – he zapped her with the FTL drive and… made her disappear! Jack tries to get Andy to cover the issue when, behind his back, Kevin grabs the keys to the jeep and dashes off to look for the missing scientist.
Meanwhile, things aren't going well for Allison either. On the way to her conference, she blew a tire on a deserted road, where a girl's father just drove over a cliff. Allison springs into action, then finds and saves the girl's father.Back home, Jo and Carter find Kevin at the outskirts of town, with Dr. Marten in tow, completely thrilled by her trip. Jo tries to keep her from spilling too many beans to the government – if information gets out that the FTL drive is based on the same device that sent everyone back in time, all of their lives could be in danger. And Zane won't let up on Jo ever since he found out they were an item in the alternate timeline. Just when she thinks she has him in check, he shows up at her house with a blowtorch and burns the whole thing to the ground!
original airdate July 18,2011. rating 2.16 million
song--Eureka Theme song--"Eureka On My Mind" by Bear McCreary