Chuck juggles his two lives as he trains new Nerd Herder Hannah and gets his very own asset who is caught up with The Ring. Chuck thinks he can handle his asset all on his own but Sarah and Casey feel the need to intercede. Meanwhile, Awesome must lie to Ellie when she starts to ask questions about Chuck and Morgan, Jeff and Lester do some recon work to learn more about Hannah.

After his intuition is wrong while working on a stakeout, Chuck feels morally obligated to make things right, even when both Sarah and Casey refuse to help with Chuck's new mission. Meanwhile, Morgan has to participate in a sales competition that could decide his fate at Buy More.

Chuck and Sarah suspect Casey is carrying out private missions. Chuck fears the CIA's new operatives will render him obsolete. Morgan settles in with a new roommate. Awesome becomes uncomfortable with Ellie's research.

Chuck turns to Verbanski for help tracking a computer virus. Lester and Jeff's relationship is complicated by a new Buy More employee.

As Chuck is beginning to adapt to his new life as a spy, a doctor who could possibly "cure" Chuck is murdered. Chuck then begins a high-speed fight for his life, all while trying to decide which of his two new colleagues might be out to get him. Meanwhile, Chuck's sister Ellie invites Sarah to dinner to meet the family.

While coping with the realization that Sarah still has feelings for Bryce, Chuck must assume his toughest cover yet by going on a mission as Sarah's husband. The team must foil the plot of a politically connected counterfeiter, who may be endangering the lives of Anna, Morgan and Anna's parents. Both Morgan and Anna also find themselves in the cross hairs.

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. Meanwhile, Captain Awesome's perfect parents decide to pay Devon and Ellie a surprise visit to help them plan the wedding, and Emmett Milbarge introduces an "Employee of the Month" contest to the Buy More, but the employees start their own contest instead.

In this Halloween episode Chuck meets a Federal agent just like him: A computer whiz whose brain is important to national security. However, Chuck soon has a personal dilemma arise when he has to decide whether or not to turn the man over to Sarah and Casey or to help him escape his handlers.

Chuck foils a plan to kill Tyler Martin, an international rock star. Chuck's night out with Tyler leads to trouble. Morgan holds a contest among his fellow employees.

Chuck and Sarah's romantic mission is canceled with the arrival of Hugo Panzer and Heather Chandler. But Chuck grows more interested when the manipulative Heather claims to know a secret about his mom. Meanwhile, as Morgan prepares the Buy More for a huge video game release, he gets a surprise from Big Mike.

Sarah takes dangerous measures to help Mary Bartowski bring down Alexei Volkoff, as Chuck worries that she may be getting in too deep. Sarah, though, must enlist the help of Chuck, Morgan and Casey to complete her undercover mission. Meanwhile, Ellie and Awesome are at odds over what to name the baby.

Casey, Chuck and Sarah are sent to Morocco to rescue Roan Montgomery. Morgan plans to meet Alex's mother and Mary spends some time with her family.

Valentine's Day is interrupted when Chuck and the team are sent on a mission to England to protect a reclusive young heiress, Vivian McArthur. Meanwhile, Casey gets an offer from the mysterious Jane Bentley. Back at home, Ellie and Awesome find an unlikely solution to a parenting problem, as Morgan ponders a big move.

Chuck encourages Vivian to get in touch with her inner villain for a mission. Morgan's search for a new roommate has unexpected results.

Chuck is put in charge of a top-priority mission, but his leadership skills are pushed to the limit when there is a murder in Castle. Meanwhile, Awesome takes on a mission of his own when Ellie finds an alarming new hobby. Elsewhere, Morgan's leadership is also tested when his Buy More troops wage war against Large Mart.

With the help of his old nemesis Alexei Volkoff, Chuck and the team hunt down a deadly weapon, The Norseman. In a pre-wedding surprise, Sarah springs a pre-nup on Chuck.

As the team takes on a missing persons case, Chuck and company struggle to establish themselves as Carmichael Industries in the face of a rival security firm led by the tough and efficient Gertrude Verbanski. Meanwhile, Morgan continues to adjust to the Intersect while Chuck adjusts to being his handler. Also, the Buy More finds an unlikely spokesperson to help drum up business.

Chuck and Sarah track an assassin who is trying to eliminate the new intersect. Morgan tries to adjust to having the intersect. Jeff exposes a new side of himself.

Chuck's latest mission has him raiding a Malibu mansion to grab a million dollar diamond being used to fund terrorism. Tagging along is an attractive but less-than-trustworthy DEA agent.

The episode begins with a flashback to the year 2004, where John Casey is involved with a female Russian named Ilsa, who claims she is a photo journalist. Later, in present day, Ilsa returns with a fiancé, named Victor Federov. Things get complicated when it is revealed that Ilsa is a French spy.

Chuck gets jealous when Sarah has to seduce a Fulcrum agent. Meanwhile, Jeff and Lester start looking for the "Buy More Babe" as a way of finding a new employee.

As the upgraded Intersect, Chuck trains to become a full-fledged spy but hits rock bottom when he flunks out of spy school and loses Sarah in the process. Meanwhile, Morgan comes home from Benihana School to help Chuck get over Sarah.

Chuck learns that his latest solo mission will be a final test to see if he is ready to be a spy. Chuck needs to put everything he has learned into action to avoid going back to his old life while Sarah and Shaw observe his every move.

Chuck struggles with disturbing dreams and now he believes his most recent dream predicts danger for a visiting head of state. General Beckman however, is unconvinced and assigns Chuck to meet with a CIA psychiatrist Dr. Leo Dreyfus. Meanwhile, Ellie gets surprising news and Anna returns to the Buy More to talk to Morgan.

Chuck and Sarah try to become better communicators as they join Ellie and Awesome on a trip to Costa Gravas; a forbidden romance may put Morgan at odds with Col. John Casey.