In this season 3 premiere Carina returns and emotions get in the way when Chuck gets assigned with a new mission with Sarah

Chuck gets a new mission when Sarah's best friend Carina comes through town with her fianc Karl. Things get complicated when Chuck wants to hash out his and Sarah's relationship problems while theyre on the mission. Meanwhile, Morgan finds himself in trouble when he lies to Jeff and Lester.

Chuck must use his relationship with Awesome to protect a visiting dictator, Premier Goya, who is the target of an sleepytime. While Awesome is excited about the prospect of being a spy, Chuck is more concerned about Awesome and Ellie's safety.

When Awesome is mistaken for a super-guy, he begins to realize that his fate may be in Chuck's hands.

CIA agent Daniel Shaw assigns Chuck to his first solo mission in Paris, ignoring Sarah and Casey's wishes. During the flight to France, Chuck befriends Hannah and flashes on another passenger - the imposing Hugo Panzer. Meanwhile, Casey helps Morgan battle Jeff and Lester for control of the Buy More.

Chuck tries to balance his two very different lives as he trains a new Nerd Herder, Hannah, and gets his own asset. He thinks he can handle is asset on his own, but Sarah and Casey believe that they need to help Chuck. Meanwhile, Awesome lies to Ellie when she starts asking about Chuck and Morgan; and Jeff and Lester do some searching on Hannah.

Chuck encounters a rogue Ring operative who stole a mask and Chuck has to attempt to recruit this operative. What begins as a simple mission quickly turns sour as Chuck realizes he has a personal history with the operative. Meanwhile Devin struggles with keeping Chuck's secret from his wife.

Chuck promises to cook dinner for Ellie, Devon and Hannah, but must first complete a mission that involves him impersonating the world's most dangerous assassin. Meanwhile, Sarah tries to keep her relationship with Shaw strictly professional.

When Chuck has problems flashing, he is left back at the castle during a mission.

Casey carries out a side mission for his old commanding officer James Keller that leads to him committing treason. When Chuck learns the dark truth about Col. Keller, he and Sarah set out to break Casey out of jail and clear his name. Meanwhile, Awesome's plan to keep Ellie out of danger gets more difficult when she gets her dream fellowship.

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 has his pick of the best CIA agents for an undercover operation, but he has only one girl in mind for the job, Sarah. Casey, Morgan and Awesome team up to help Chuck win her back.

Sarah and Shaw reunite to find the Ring operative behind the passing of Shaw's wife. Sarah has faith that Shaw is ready for the mission but Chuck is worried about his emotional stability. Meanwhile, Morgan considers leaving the Buy More.

Chuck and Sarah ride on the same train as the Basque terrorist Juan Diaz Arnaldo.

The team meet CIA super couple Mr. and Mrs. Turner, when a software is developed, that could render CIA security useles

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's father returns when he finds out Chuck uploaded the new Intersect. Chuck enlists the help of Morgan on a new mission.

Chuck, Sarah, and Casey hunt down Ellie and Shaw... only to discover that Shaw is a working CIA operative, and has had Chuck declared insane because of the Intersect. When the CIA turns against the team, they must go rogue to save themselves and their families.

The Ring closes in on Chuck and the team - and their families.