Chuck becomes worried when Sarah goes to extreme measures to help his mother take down Alexei Volkoff. Ellie and Devon have trouble deciding the name of their new baby.
Chuck and Morgan embark on a mission to take down Alexei Volkoff, while Sarah tries to rescue Chuck's mom. Casey tries to get to know his daughter better, and Ellie eases Devon into fatherhood.
Chuck, Sarah, and Casey must travel to Morocco to rescue suave former agent Roan Montgomery. Morgan meet's Alex's mother, and Mary Bartowski acclimates herself to civilian life and spends time with her new granddaughter.
Chuck and Sarah's Valentine's Day is put on hold when they must travel to England to protect an oil baron's daughter. A mysterious woman makes Casey a compelling offer. Ellie and Devon receive parenting help from an unusual source.
Chuck worries about his job as new agents are brought in. Chuck and Sarah suspect Casey is going on rogue missions. Morgan tries to make the best of things with his new roommate.
Chuck's leadership skills are tested when someone is found murdered in Castle. Ellie picks up a hobby that worries Awesome, and Morgan is stuck in the middle when the Buy Morons take on the neighboring Large Mart.
When the CIA targets Vivian Volkoff for assassination, Chuck turns to an unusual ally to protect her: Vivian's father, Alexei. Ellie suspects her mother doesn't want her to find out about her father's past.
Chuck and Sarah call in her con-artist father, Jack Burton, to help recover the wedding funds they lost. Morgan talks Casey into meeting with Alex's mother.
Devon's plans for Chuck's bachelor party go awry while unexpected visitors crash Sarah's bachelorette party. Ellie discovers an important secret about her father's research.
When Chuck and Sarah enlist the help of Alexei Volkoff to stop his daughter from destroying their wedding, the CIA sends one of its best agents after them.
Now the head of his own spy agency, Chuck takes on a slick thief and an investor who has stolen money from dangerous criminals. Morgan aids Chuck in planning a surprise for Sarah. Jeff and Lester launch their latest scheme at the Buy More.
As Carmichael Industries takes on a missing persons case, Chuck must acclimatize himself to being Morgan's handler and deal with a rival agency. The Buy More gets a new spokesperson.
Chuck worries Morgan is letting the Intersect change his attitude for the worse. Sarah gives Casey relationship advice on Gertrude Verbanski. Captain Awesome discovers shocking news about Jeff and Lester.
Chuck and Sarah discover who is behind a plot to take down their company. A computer virus creates havoc as the Buy More prepares for Christmas. Ellie tries to make Christmas plans for everybody.