It's time for Chuck and Sarah's respective bachelor and bachelorette parties, which means a couple of things: wacky, Three's Company-style misunderstandings. (Check.) And some big government mess is going to get in the way. (Check.)
As Awesome plans the big Vegas bachelor weekend for Chuck, Morgan, Big Mike, Casey and Jeffster!, Ellie's spending lots of time with her dad's computer, getting closer and closer to Agent X. Vivian's cronies are also getting close to finding what they're looking for, though, and that's Orion's computer so they can track down Agent X themselves. They find some weird device that leads them right to the computer during the bachelorette party. But moments before they show up at Ellie's, we realize Ellie and Awesome have accidentally switched bags. So they show up at the bachelor party in Vecas. Yes, I said Vecas. As in Las Vecas, the camp site where Awesome took the gang (they only thought he was saying Vegas). Casey's stealth training in face painting and spear making serves him well as he takes out all of Vivian's mercenaries and saves Jeff, Chuck and the computer (though the computer does take a knife, Chuck obviously fixes it later). After the guys return from the party, Chuck and Ellie finally come clean with each other. He tells her he's the Intersect, which makes him Agent X, duh. Ellie tells him he's wrong about that, since his father wrote about Agent X before Chuck was even born.
So, they get the computer working again (Chuck's Nerd Herder skills pay off again), and realize they're being led to an old house in England. They leave Ellie behind because she's a mommy and head to England, where they find a little old British lady living in the house. She serves them tea, and acts all sweet and pleasant, but when Vivian's men show up, she pulls out her collection of grenades and automatic weapons and blows the whole place apart. Turns out this Agent X fellow, Hartley Winterbottom, is her son. She tells them that the CIA turned him into a machine and then turned its back on him. Chuck assures her that his father didn't, and she immediately knows whose son he is, since Bakula and her son were friends. Sarah and Chuck find Agent X's spy will and take it back to Castle to open it with Ellie. When they open it up, they find information about Hartley Winterbottom, including a photo of a much younger Alexei Volkoff. They all discuss what to do with the news that the CIA created this evil mastermind, when Casey pulls up some information on a computer that confirms this. Then he brings them a room and unplugs anything the CIA could be listening in on. He tells them they have to pretend they didn't see this. When Ellie protests their dad wanted them to find this, Casey tells her how it will play out if they don't let it go. Some very important people covered this up, and they'll send someone like Casey to kill them all, which isn't what Bakula would have wanted. They all agree to let it go. Back at the apartments later, though, Ellie tells Chuck this isn't over for them. She says it's not for the CIA to solve; it's for them, the Bartowskis. Dramatic music plays as Casey puts Agent X's spy will away in the secret room he and Robin Givens built at Castle. Something tells me we haven't seen the end of that spy will. Or of Alexei Volkoff.
Oh, and also? Casey (not Jack Bauer) just might have been the guy who killed Osama bin Laden.
A few things Chuck wants us to know. Ellie and Chuck have been lying to each other about who and what they know. Vivian wants to track down and kill Agent X, the only man her father was ever afraid of. Now: A sexy lady walks down some stairs and struts through a warehouse. When a guy points a gun at her, she flashes a badge and pretends she's here to help with some break-ins. Then she drops the papers she's holding, and when he leans down to pick it all up for her, she knocks him out with a punch to the face. That's when Riley comes in and tells her what great work she's done. They unlock a box and pull out what looks like a GameBoy. The sexy lady skeptically asks if it's the computer with all the Agent X files. Riley says this is just a tracker to lead them to it, which means someone in the CIA is keeping track. Sexy lady thinks this was way too easy, and she assumes the CIA is protecting the real computer much better.
Cut to Ellie spilling spaghetti on the computer's keyboard. Then shirtless Awesome comes down and asks her to put some tanning lotion on him, since he's leaving for Chuck's bachelor party soon, and it's going to be sunny in Vegas. She rubs it on and tells him about this picture of an old house that she came up with on her dad's computer. It was at the end of some sort of crazy story problems she solved, apparently, and now she can't figure out why. She can't understand why her dad wants her to have this picture. Awesome asks her why she's still working on this when she should be getting ready for Sarah's bachelorette party. Ellie promises she'll put it away as soon as the party begins. Awesome goes upstairs to finish packing for the "dude trip." He's all pumped up: "Vegas, baby! Vegas!"
Buy More. Jeffster! are also excited for Vegas, judging by their crazy gear. Lester asks Morgan which casino they're hitting up first, since he's got a "fat stack burning a hole in my crotch." Morgan says he doesn't know, though, because he put Awesome, a Vegas expert, in charge. They ask Casey which casino he loves, but he says the best things about Vegas are the gun ranges. He brought some of his "fancy targets." He opens a binder to display a picture of Osama bin Laden with a target on his head. I knew it was Casey, not Jack Bauer, who killed bin Laden. Or maybe they worked together? What a team those two would make, right? Terrorists beware! Big Mike comes up and sulks because Morgan's mom won't let him go to Vegas. Morgan falls victim to the Big Mike pouty face and tells him to march into the house and tell his mom that he has to work at the Buy More all weekend. And Morgan promises to vouch for him. Big Mike hugs Morgan and tells him this is the greatest thing a white person has ever done for him.
In their crazy giant bathroom, Sarah's taking a bubble bath while Chuck's packing. He wonders what a bachelor should wear to Vegas, and Sarah tells him that a bachelor does not wear that. We finally see Chuck, in beach shorts, a button-up shirt and a sport jacket. He wonders why she's not digging the business up top, party below the waist look he's got going. Then he comments on her sexy bathing, and she says she's just reminding him what he'll be missing while he's in Vegas. He promises to remember, then asks what Ellie's planning for her. Sarah says she has no idea because every time she tries to get information from Ellie, she's on their dad's computer. Chuck says that Ellie's always been into puzzles. One of his earliest memories is when she solved the twelve-sided Rubik's cube before he'd gotten his out of the box. Sarah asks if Chuck's told Awesome that he knows he didn't swap out the hard drive. Chuck says he hasn't talked to him yet, but plans to this weekend. He can't imagine a better place for a sincere, heartfelt conversation. Sarah scoffs that he's really never been to Vegas.
When Chuck shows up to get Awesome later, Ellie quickly hides the computer in her bag and answers the door. She lies that she was reading a book, and Chuck tells her she doesn't have to lie; he knows she's planning Sarah's party. Awesome comes down and tells Chuck he's going to make a man out of him this weekend. Then Awesome grabs one of the two identical bags from the living room and leaves. Somewhere else, Sexy Lady and Riley lock in on the computer's location in Echo Park, Los Angeles. Cake.
Awesome is driving the gang -- Chuck, Morgan, Jeffster!, and Big Mike -- in a stretch Hummer toward Vegas. He tells them to get ready, because even if they've been to the city of sin before, they've never been with him. Chuck thanks him for planning this trip. Awesome tells him he lives for this. Then he tells everyone they need to think of this weekend like a war (Casey's listening!), and "when we get there, we immediately take over the Strip." Lester says "high-rollin' on the strip" and throws a bunch of coins in the air, which come crashing down all over everyone. Morgan asks what the hell, and Lester says he's making it rain. Then he adds, "Dollar, dollar coins, y'all." Awesome tells Lester to save his energy because Vegas is the land of excess. "And for those who like to chase tail, there is plenty of that, too." Big Mike tells them to rest up since they might not sleep again for a long time. Just like The Hangover.