Ellie's big day finally arrives, and Chuck must save her life and her wedding from being ruined by Ted Roark and FULCRUM.

Chuck and Sarah go AWOL in their search for Chuck's kidnapped father, so Casey is ordered to pursue and return them after being promoted to Colonel.

After Chuck's father is kidnapped by FULCRUM, Chuck finds himself in the need to ask his imprisoned ex-girlfriend Jill for help.

Chuck's life seems to be coming together, his long-absent father has returned and he is about to land his dream job at Roark Instruments.

A female agent is sent to evaluate Sarah's performance as Chuck's handler, when Chuck's feelings for her become an issue to General Beckman. However, the presence of a new agent causes complications.

Chuck is contacted by "Orion", the creator of the Intersect computer. He starts having trust issues and doesn't know who to lean for help.

When Cole Barker escapes FULCRUM with new information, Sarah and Casey go looking for a man that seems to be behind FULCRUM's plans to build its own Intersect, forcedly leaving Chuck and Barker in a safety bunker, as FULCRUM is still actively searching for them.

Chuck gets jealous when Sarah has to seduce FULCRUM agent Cole Barker, codename "Beefcake".

When Anna's new boyfriend turns out to be connected to the Triads, Chuck is ordered to spy on him by becoming his friend, thereby endangering his friendship with Morgan.

It is Valentine's day and emotions are boiling at the Buy More. However, Big Mike has to face a divorce, so the Buy More team try to distract him.

Chuck has to protect rock star Tyler Martin, while Morgan wins two backstage passes to Martin's concert, so he needs to decide who will become his "plus one".

It's Christmas Eve and the Buy More team works on the decorations for the annual sale while watching a live car chase on TV. When Devon and Ellie come for a visit, the car chase ends at the store with the perpetrator taking everyone at the store hostage.

Sarah's father, a con artist, comes to meet her, revealing that he conned a Saudi Arabian sheik, Rajiv Amad, out of nearly a million dollars. The sheik turns out to be connected to terrorist fundings, so the General wants Sarah and Chuck to gain intel from Sarah's father, but things get complicated when Amad shows up.

The team is assigned to survey the Global Launch Agency, when intel shows that someone might penetrate their security. During the surveillance someone intrudes the lab who turns out to be Casey's former sensei Ty Bennett.

After finding out that Chuck's ex-girlfriend Jill is FULCRUM, he is ordered to use her to infiltrate FULCRUM.

The team needs to acquire a FULCRUM agent list by solving several riddles left behind by Guy Lafleur.

At a BioScience conference, Chuck runs into Jill, his ex-girlfriend who broke up with him and later dated Bryce Larkin. He flashes on her boss, Guy Lafleur, who is suspected to be working on biochemical weapons, so Chuck is ordered to reconnect with Jill in order to gain more information on Lafleur.

Efficiency expert Emmett Milbarge pays the Buy More a visit to inspect the branch, while a global terrorist looks for Jeff. Chuck needs to socialize with Jeff to find out about his connection to the terrorist. Finally, it all comes down to video games and the prevention of World War III.

Chuck goes undercover at Sarah's 10-year High School reunion, where they meet the girl that tortured Sarah back in the old days.

Bryce Larkin returns to town with news about FULCRUM. They have hired a wealthy software magnate named Von Hayes to decrypt information on a stolen chip containing a refresh to the Intersect with highly classified information. Bryce and Sarah have to pose as a married couple at Von Hayes' dining party to steal back the chip, while Chuck has to pose as a waiter.

Chuck needs to go undercover to seduce a woman named Sasha Banachek, so an old school spy named Roan Montgomery is assigned as his mentor.

Chuck, Sarah and Casey try to retrieve a vital component for the new Intersect: The Cipher.