Eva is all set to seal up the bunker for good, employing the services of some scientist who has bombs full of a nanofoam that is sealed together at a molecular level, making it unbreakable. Carter tries to find out what she's doing and why, and even resorts to telling on her to General Mansfield while Allison mislabels the dead bodies so they're shipped to Henry's garage for further study. He finds out that the bodies aged rapidly, going from forty to eighty in just under a month. And that's when the purple goo Zoe slipped in a few weeks back comes into play as SARAH claims her DNA has changed and she gets cataracts. Allison is also feeling very tired and worries that she was exposed, too. But she's just pregnant.
Meanwhile, Fargo finds a picture of himself standing in front of Café Diem's wall of fame before Eva had the pictures taken down. He examines it with a microscope and finds a team shot with a woman in it who looks exactly like Eva. Armed with this, Carter heads down to the bunker, where he finds Eva. What he doesn't know is that she moved up the foam bomb detonation from tomorrow to … right now. She was planning on sealing the bunker shut with her inside. Now she's sealed both her and Carter inside. But at least she can finally tell us her story: she was a lab assistant for a group working on the first atomic bomb. The leader of the group was her brother. They set one off and it worked great except for the side effect of creating bariogenic radiation, which rapidly aged the three men. They were sealed down in bunker where they tried to find a cure, but couldn't in time. Meanwhile, Eva was also exposed but for some reason it had the opposite effect on her. She's actually 107 and looks great. She says there's a whole storage pool full of purple goo down there and if they can get some out, Henry can use it to save Zoe. Oh, except that the storage pool was damaged in the nanofoam bomb blast and it's all leaked out. So now not only is there no bariogenic goo to save Zoe, but it's also all in the groundwater, meaning the rest of Eureka has been exposed to it as well. Fortunately for Zoe at least, Eva has that small tube of goo her brother left her. Now they just have to get it to the surface.
In the end, the unbreakable nanofoam proves to be easy broken and Carter and Eva are freed from their tomb. Henry is able to save Zoe, but there's not enough purple goo left to save anyone else. But that's okay because Eva's brother was able to create another atom bomb full of anti-bariogenic radiation and it's hidden in the bunker just waiting for Zane to find it and set it off. That's right: they had to detonate a seventy-year-old atom bomb underground. It works and everyone is saved! General Mansfield shows up looking to arrest Eva but Carter and Henry help her escape. She says good-bye to Henry and Eureka tearfully and with gratitude and she isn't evil after all except for how she fired all those hard-working GD employees which indirectly caused the death of Stark. With no Eva to take the fall, Mansfield fires Carter. Whew! They sure packed a lot into one little episode, didn't they?
Zoe's working the morning shift at Café Diem. Lucas has stopped by for a visit and to invite her out to Pilar's big party tonight, but Zoe says she's exhausted from work. Lucas tries to wake her up by dragging her into his lap for some canoodling, which is a terrible idea when the girl's father is in the same room. Yes, he's turned the other direction but through the magic of mirrors, he sees everything and clears his throat to register his disapproval and disgust.
Zoe looks to Jo for consolation, asking why dads have to ruin "everything." I don't know, Zoe, why do you have to make out in front of your dad? Just go someplace private (if such a thing exists in Eureka) and get it on there like every other teenager in the history of the universe. Jo obviously has issues of her own, as she says dads are men and men suck. You see, she's mad at Zane for freezing up when she said she was serious about him last week. Oh, that was freezing up? I thought they just cut the scene early before he could respond. My bad! Jo says they haven't talked since, although I have no idea how long ago that was. Zoe gives Jo a heads up that their first conversation is about to happen as she runs away.
Zane takes a seat next to Jo and says hello like nothing happened. Jo doesn't respond until Zane asks if she wants to have a "bite" with him and she sees her opening: "a bite? Well, we wouldn't want you to commit to a whole meal." Zane does that thing men do where he pretends not to know what Jo could possibly be so upset about in the futile hope that feigning ignorance will deflect confrontation. Men, that never, ever works so just stop doing it. It's annoying and makes things worse. Jo says he couldn't "handle" her feelings for him and takes off. Zoe decides Jo hasn't done enough and gets Zane good by calling him "ruiner." Oh, snap. Not really. That has way too high of a syllable to letter ratio to be a put-down. Also, Zoe, Zane saved you and your little friend's lives two weeks ago when you decided to go exploring in random hallways you found in the school basement, so why not show a little gratitude?
This brings us back to Carter, who's having breakfast with Allison and Henry. Efficiently, the breakfast doubles as a planning session for how to get to the bottom of Eva's latest evil plan to get rid of the bunker: she's hired an "outside contractor" named Hendrix who's set up shop outside the bunker. Allison doesn't know what he's up to there, but she does know that Eva's trying to have those bodies moved again. Henry won't hear of this, saying he has to get his hands on the bodies so he can autopsy them (as much as one can autopsy a skeleton) and find out who they are and how they died. Allison says the first part of that is going to be difficult since Eva's redacted all photos of everyone involved in Eureka from 1939, including the photos that used to be on Vincent's Wall of Fame. Carter wonders if one of those photos holds the key to Eva's secret, then realizes that while they don't have the photos on the wall anymore, they do have a photo taken in front of them back in when they were there. He calls Vincent over and asks if he still has the pictures he took in front of the wall with Fargo. "You mean the ones where I look like Sasquatch?" Vincent asks. "Yes! Those are the ones!" Carter says. Vincent is offended, but you shouldn't say things like "I look like Sasquatch" if you can't take it when people don't refute it. And if you're that sensitive about being called Sasquatch, perhaps you should, like, get a haircut. Vincent tells Carter to ask Fargo and storms off while Henry cracks up. And it's task assignment time! Carter will try to get the pictures from Fargo. Jo will be thrilled to know she'll be checking out Hendrix. And Allison will find a way to get those bodies to Henry.