Allison reports that Spot just broke through the shut-off valves in the main pipeline and is now unleashed upon Eureka. Damn, those shut-off valves must have been a big part of the GD building's structural integrity for it to make the entire building shake like that. Also, I'm sure there's enough radiation in Eureka for Spot to grow big enough to put the entire West Coast in danger. Carter thinks Spot will go for Glowbidium first, and he knows the only place left in town to find it -- his house.
Carter calls Zoe en route to his house. She's at work, of course, and thus in no danger. But Lexi is home. Hooray!
Cut to Lexi washing her hands. The doorbell rings. Lexi orders SARAH to get the door, but SARAH does not respond. Lexi leaves the bathroom and we see Spot coming up from the drain in her sink. Could be worse, though. It could have been the toilet.
As Carter races towards the house, Spot feasts on Glowbidium. SARAH's systems start to shut down as Duncan enters the house to finally confront Lexi once and for all. "You don't just get to decide everything!" he says. That's right, Duncan. He says all the right things: he knows children will change their lives and he won't be able to travel the world for a while, but then when he does, it'll be with them, and he "can't think of anything better." Enh, depends how old those kids are. My mom once tried to travel to another country with three-year-old me and my one-year-old brother. It was not a fun plane ride for her. Or us. Or anyone else on the plane. Lexi can't trust Duncan to really mean the things he says now six months or even six years down the road. Oh well, Lexi. People change sometimes and you can't predict it. That's life. Deal with it. Duncan says he might have freaked out before, but he knows now that Lexi has no reason to doubt that he has a lifetime commitment to his children. Lexi gives us the "real" reason why she didn't want Duncan to be a part of his kids' lives: growing up, she always felt like her father would rather be somewhere else and she doesn't want her kids to feel the same way. You know, Carter never said anything like that about his father. I have a feeling it's not that Lexi's father was a bad dad, but that everyone around Lexi wishes he were somewhere else.