Back at FBI headquarters, Mark is tearing Janis a new one for her recent sloppy work and asks, "What's up with you?" so Janis pulls the "I'm pregnant" card. Mark transforms into a giant, FBI agent-shaped marshmallow and tells Janis how he never doubted he could trust her (good to know those agent-ly instincts are sharp as ever...), then gets back to babbling about Dyson Frost, whom he would have surely left Olivia for had that witch Alda not shot the genius. Anyway, Mark is puzzling over Dyson's last words when it hits him: the lady Mark sees every day is the white queen chess piece that he found at the Pigeon, Utah, blast scene. He breaks open the piece and we see that Dyson Frost had secreted a QED ring away inside it. Janis looks stunned by the discovery -- whether because she's genuinely surprised or because she's taken aback at what Mark figured out.
Gabriel is trying to stammer out backstory to Olivia when Vreede comes up, looking understandably alarmed at his colleague's wife just smiling and nodding at this surprise madman in the hall. Gradually, Olivia and Vreede tease the story out of Gabriel: He was part of a mass experiment where "Every other day for two years, we came in here. They put us to sleep. I never knew where I'd end. Sometimes it was a short trip -- I was eating a tuna sandwich, cat jumped on the table, kitty likes tuna -- sometimes it was long trip. He watches from [the corner], the doctor Frost. He told us we were special, 'cause we could remember things, everything. And when we came back, we had to write it down, every little detail." Vreede realizes that Dyson Frost inflicted these savants with hundreds of flashforwards. Gabriel says, "When they finished with us, when they used us all up, he told them to kill us so we wouldn't tell." Vreede leans in and says emphatically, "He's dead now. You don't have to be afraid of him anymore." Gabriel smiles with relief and says, "The early worm catches the bird. I've been waiting. I've been waiting --" "Gabriel, why have you been following me," Olivia says, treading all over Gabriel's long-overdue emotional catharsis. He tells her it's because she's going the wrong way and he has to turn her around: "In the futures I saw, I always saw you, Olivia. And you're always with Lloyd! In Harvard, by the pipe shop -- I tried to smoke that day, but I threw up. And we were friends. We were friends because I was the janitor in --" "No! Gabriel, I didn't go to Harvard!" Olivia says. I must admit: nice writing here, because it calls back to the Olivia/Lloyd scene where Lloyd explains the multiverse theory and Olivia admits she turned down Harvard Medical School for a life with Mark in California. Anyway, Gabriel is very, very adamant that Olivia is supposed to be with Lloyd, so she needs to fix her future stat, and the petty part of me is very, very glad that the universe is all, "Oh, Mark's a mistake." But there's another part of me that's all "Really? The fate of the universe depends on whom Olivia's wed to? Isn't that a little beyond believing?"