A few things Chuck wants us to know: Chuck wasn't the first Intersect. Agent X was. And he became Alexei Volkoff. Whose daughter has control of a crazy weapon called the Norseman, which she tried to kill Sara with last week. Now it's "Five Days Ago." Chuck and Sarah are in bed, being adorably nervous about their upcoming wedding, which is exactly one week away. They freak out. Then they freak out some more, because: What if it's cold feet? Chuck's sure it isn't, and thinks they should try out the wedding on their own: a dry run with no people or cameras around to make them nervous. Chuck: "Practice makes..." Sarah: "Perfect. We'll be ready for anything."
But they couldn't have prepared for this. Close-up of Sarah's ring as she's wheeled into the hospital on a stretcher. Chuck fills in Ellie and Awesome: the poison is Thorium. Ellie says that's a radioactive metal, not a poison and wonders the form: It was liquid. Ellie asks Awesome if he has any ideas, but he says poison guns aren't in any textbooks. They put Sarah in a tub of ice, which helps her for now. But Ellie and Awesome need to know everything about this poison. And they need an antidote. Morgan comes in and joins everyone else who's gathered (Casey, Chuck's mom...). He says he told everyone at the rehearsal that it was food poisoning and she'd be all right. Then he wonders if that's true. Chuck holds her hand when she wakes up a little and tells him he looks worried. He lies that it's about the wedding, and she tells him: "Don't freak out." They talk sweetly until she drifts off again, at which point Chuck tells Casey they have to break in to the maximum security prison that Volkoff's in and get him out; he's their only hope.
Prison break. Casey and Chuck, disguised as guards, make their way in with the help of Mary back at Castle, who's guiding them and shutting off alarm systems along the way. But when they get to Volkoff's cell, the door's open. Not a good sign. And he's gone. When Chuck asks Casey where he is, a voice tells Chuck "He's gone, Bartowski." Mary wonders what's going on. Casey says he knows that voice and he goes pale, which worries Chuck more than a little. Casey asks Chuck if he remembers Casey telling him about the guy who they'd hire to put a bullet in all their heads without breaking a sweat? "This is the guy they hire to kill that guy." Chuck turns to a TV monitor in the cell (convenient!) to find Richard Burgi, a CIA guy named Decker, who tells Chuck that his CIA resources are revoked for breaking in. Chuck tells him he needs to save Sarah, but Decker has no sympathy. "Stand down or get buried." Chuck says no, and uses a chair to smash the TV. He turns to Casey and says, "That guy might think he's a hard-ass, but I'm the Intersect." No room for the Cake opening this week; too much good stuff to pack in.