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When Chuck finds out that his former professor...

When Chuck finds out that his former professor is a government operative who is being hunted because of a sensitive top-secret file, he returns to Stanford University, the institution from which he was expelled. While using his past experiences to determine what the professor knows, Chuck discovers some shocking secrets about his own life. More importantly, Chuck learns the truth about his former friend Bryce Larkin (recurring guest star MATTHEW BOMER), who was responsible for Chuck's expulsio

Chuck battles with his real love life and...

Chuck battles with his real love life and "cover" love life when he meets a very pretty girl named Lou (recurring guest star RACHEL BILSON), who seems interested in the real Chuck. On the other hand, Chuck's relationship with Sarah heats up as they go on a double date with Ellie and Captain Awesome (recurring guest star RYAN McPARTLIN) and try to explain their sex life. Meanwhile, a poison specialist trying to obtain codes to nuclear facilities uses a "truth" potion to help him get answers. A

When Chuck starts dating Lou (recurring guest...

When Chuck starts dating Lou (recurring guest star RACHEL BILSON), a sandwich maker, and things seem to be going really well, the situation incites some jealousy from Chuck's "ex-girlfriend" Sarah, who discovers that her feelings may not have been just part a cover story. Things get even more complicated when it is discovered that Lou is in a smuggling ring. Is her relationship with Chuck another fraud, or is it real? Meanwhile, Morgan becomes acquainted with an unlikely girl.

At Thanksgiving, Bryce (recurring guest star...

At Thanksgiving, Bryce (recurring guest star MATTHEW BOMER) returns, after being assumed dead. Secret internal committees trying to destroy the "intersect" -- otherwise known as Chuck's brain -- saved Bryce, hoping that he would help them locate it. But in order to prove to Sarah, Casey and the rest of the CIA that he is not rogue, Bryce needs Chuck's help. Upon seeing former lovers and partners Bryce and Sarah back together, Chuck grows jealous and doubts any future with Sarah. Meanwhile, a

Still licking his wounds after realizing...

Still licking his wounds after realizing Sarah still has feelings for Bryce (recurring guest star MATTHEW BOMER - "Traveler"), Chuck must assume the cover of being Sarah's husband on a mission to foil a politically connected counterfeiter and yachtsman. Emotions and sea legs are tested when Chuck, Sarah and Casey head to the marina to scuttle a plot that also puts an unwitting Morgan and Anna (recurring guest star JULIA LING - "ER," "Studio 60 on the Sunset Strip") squarely in the crosshairs. Me

Chuck discovers that several Russian arms...

Chuck discovers that several Russian arms dealers are secretly meeting in Los Angeles. One particular Russian woman catches his attention, and he flashes on her as being Casey's ex-girlfriend. Chuck grows intrigued and begins to pester Casey about his history with the woman. After learning she is set to marry one of the Russian arms dealers, Chuck insists that Casey fights for his woman. Will Casey go after his true love without compromising his identity? Meanwhile, Captain Awesome (recurring gu

Captain Awesome (recurring guest star RYAN...

Captain Awesome (recurring guest star RYAN McPARTLIN) asks Chuck if he can have Ellie's hand in marriage, and then insists that Chuck hold on to the ring until the proposal is planned. Chuck locks the ring in his Buy More locker, but returns the next day to discover everything has been stolen from the store. Meanwhile, Casey and Sarah discover that the CIA has been spying on them in hopes of discovering "the intersect." With Chuck's identity and life on the line, the National Security Agency has

Chuck's sister throws him a party to help...

Chuck's sister throws him a party to help him meet more women.

Chuck gets more than he bargained for when...

Chuck gets more than he bargained for when he opens an email from his college roommate Bryce.

Sarah's date with Chuck is interrupted when...

Sarah's date with Chuck is interrupted when she has to fight of NSA agents who are after him.

Chuck unknowingly tangos with a deadly assassin...

Chuck unknowingly tangos with a deadly assassin until he flashes on her.

KC saves Chuck from an attacker while Sarah...

KC saves Chuck from an attacker while Sarah fights an assassin.

Sarah and KC fight a triad gang in the kitchen...

Sarah and KC fight a triad gang in the kitchen of a restaurant while Chuck tries to hide.

While trying to diffuse a bomb Chuck and...

While trying to diffuse a bomb Chuck and Sarah kiss thinking they're about to die.

During an awkward lunch with Anna's parents,...

During an awkward lunch with Anna's parents, Morgan gets the wrong idea about Sarah when he spots her with another guy.

Captain Awesome asks Chuck for his blessing...

Captain Awesome asks Chuck for his blessing and safe-keeping of his engagement ring.

Sarah disobeys orders to try saving Chuck...

Sarah disobeys orders to try saving Chuck who is being taken to a secret facility.