Back to work already at Boston Federal Building, where Charlie sees her and asks if she's OK, and she gives him a curt "yep" before going into her office. He follows her and says, "You know I had nothing to do with the way you were taken in, right?" and she says she knows that, managing not to add, "Oh, and thanks for NOT VISITING ME IN THE HOSPITAL, Charlie." She retrieves her gun and badge from her desk. "That son of a bitch Harris. He molested three women and I put him away. That's what this is about," she tells Charlie. Instead of either of them talking about how ridiculous it is that Harris would be assigned to review Olivia's unit, Olivia says she's going to check out the building where she was held herself. Charlie tells her they had a team go over it and it was empty. The car she took, the cellphone, both clean. No prints but hers. No offence, Charlie, but maybe Olivia can make sure you guys swept the right building? I mean, agents tranqued Olivia as soon as they showed up, so it's not like she was able to confirm they were checking out the right building.
Oh, and there's a "Rachel" here to see Olivia, says Charlie. "She says you're expecting her. Who is she?" he asks, looking all serious. You know, you could have asked Rachel yourself, Charlie. THIS IS THE FBI, after all. Olivia says Rachel is her sister.
Olivia and her sister embrace in a waiting room, with Olivia telling Rachel she looks good, and Rachel demurring, even though Rachel's not the one who looks like she just fought at UFC 94. And there's a little girl there who giddily squeaks out "Hey, Aunt Olivia!" and Olivia hugs her and wants to know when she got so big. Olivia's niece presents her with a magic eight-ball. "She wanted to bring you something from her room," explains Rachel, and Olivia says she's been needing one of those, and I have to say that the eight-ball is just as likely to help solve cases at the Bureau as the current Fringe method, which is "sit around and wait for Walter to remember which experiment of his this reminds him of."
Rachel asks after the giant scratch on Olivia's face, and Olivia waves it off, saying she's working a case. Rachel tells her to go, that they'll be fine, and asks if it's still OK that they stay with her. Olivia says it is, and they arrange to meet back at five. "Go, save the world," says Rachel, but when Olivia gets on the elevator she looks a little scowly.
While driving, Olivia calls Peter at the Fringe lab. "Thank god," he says, and Olivia has no time for small talk and tells him to meet her outside in ten minutes and to bring his father: "I think we'll need him." You think you'll need him? He's the whole operation!
Soon enough, Walter and Peter load some gear in the back of Olivia's SUV while she explains that her captors put electrodes or sensors on her head and made her watch Spinal Tap. She rattles off a bunch of questions, like "who were they?" and "why would that do that?" Etc. Because Spinal Tap is hilarious, that's why. "You're like the question machine," says Walter, whatever "the question machine" is.
She tells them they'd cleared the building by the time backup arrived, but she'd snagged something and hid it. And you didn't tell Charlie about this because...?
Anyway, they dig up the thermos and Olivia hands over the vials to Walter, who analyzes them in the extra-special mobile tailgate scientific gear, which is always a big hit in the parking lot before Patriots games. As he looks through a microscope, Olivia asks if he can tell what it is. "Yes. I'm afraid I can," he says.
And we're suddenly looking at microbes on a slide, but they're not Olivia's samples; they're being projected on a screen in a classroom at Boston College, where the teacher is saying, "And so, if your high school bio teacher told you humans were at the top of the food chain, he, or she, was dead wrong," and he says that "or she" like he's saying, "Probably he, but I don't want anyone to think I'm sexist." As he switches slides, he says literally millions of organisms feed on us, and reproduce within us. He pauses to take a sip of water before continuing to talk about viruses, bacteria, protozoa and fungi: "The four musketeers of the pathogenic world." Dr. Miles Kinberg, as the plate on the front of his lectern calls him, pauses, looking like the chili he had for lunch is repeating on him. Then he collapses, taking the lectern with him, with nearby TA shrieking for someone to call an ambulance.
While the students variously mill about, take notes, head for the exits for an unexpected early break or update their Facebook pages ("Greg is thinking he might get that extension for his epidemiology paper after all"), the TA frantically does some sort of approximation of CPR, through her tears, but it's no use. Kinberg's not moving.
But something inside him is: his neck starts to bulge, and then his mouth, and then this grey slug-ish thing with little spikes makes its way out of Kinberg's mouth. The TA is screaming. The other students start screaming and run for the door (except for Greg, who needs to SuperPoke a couple of people before logging out).
After the first commercial break of the hour, we're back at the university, which is swarming with investigators, while Broyles voices over that he knows Olivia's had a rough day, but there's an event that demands their attention. "OK, where?" is what Olivia says, although the closed-captioning has her saying, "I guess there's no rest for the weary." Quite the change in tone; in one she sounds pissed, in the other, quite perky.
In the lecture hall, Walter's examining the dead doctor and talking about rapid cell deterioration: "This man suffocated from the inside," he says, and Peter, fiddling with some equipment, says it was because of the giant, slimy slug that crawled out of his mouth. Olivia trots down the steps and tells them Kinberg was an immunologist who did cutting-edge work. Walter says whatever it was ripped through Kinberg's esophagus on its way out. He's got a theory but says he'll share it "eventually." "At least he died teaching. A righteous profession," says Walter. Meanwhile, Peter's got the thermal cameras up and running, and can see the little slug as a bright red splash on the monitor, so he and the agents go on a merry chase up and down and in and around the seats while Walter looks at the slides, which are STILL changing, and gets a boner over things like "simian hemmorhagic fever," which he says makes HIV look like a common cold. And then there's the godfather: Ebola. "First the headaches, then the skin turns to rice pudding!" cackles Walter, while Peter and the agents are still chasing the thing, which moves like silverfish. It darts down the steps onto the floor, where Walter quickly traps it under an overturned garbage can. "Things like this used to happen in the lab all the time. Makes me nostalgic." Yeah, hey. Remember that time when that one woman died?