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.
While Duncan says that he knows their lives won't be free of problems but they'll handle whatever comes up, Lexi slowly lets him know that there's a giant green slime monster oozing towards them. It pools around Duncan's feet, but he's able to get Lexi out of the way as Carter runs in with the secret weapon. "This is what it wants," he tells Duncan, pulling a bowling ball out of a bag. "Bowling?" Duncan asks. Heh. Carter takes a moment to explain that the secret weapon that should kill Spot is located inside a gamma radiation shell inside the bowling ball, and Duncan is only getting more and more digested so he might want to hurry things along. Carter holds the ball out and Spot loosens his grip on Duncan and moves towards it. Meanwhile, Duncan's pants are covered in green slime, and that is tragic because he didn't bring a change of clothes. Now he's going to be walking around in green slime pants. Carter "arms" the bowling ball as Duncan, free of Spot, runs away. Carter rolls the ball and Spot eats it. Carter presses a button on his remote and the ball explodes. The cream fills Spot's insides and in no time, it's all dried up and dead and leaving a huge mess on Carter's floor. Carter checks on Duncan and Lexi, and they're making out. Carter doesn't like seeing his sister make out with a guy. He should be insulted that they cared so little about him that they got amorous while he was at risk for being eaten by green slime. Lexi says yes to whatever Duncan proposed off-camera, which is probably marriage. "We don't have to live here, do we?" he asks. Lexi shakes her head no. Ohmigod, could it be true? Is she really leaving?? Oh, but this is excellent news! Hooray for Duncan!