Still licking his wounds after realizing Sarah continues to have feelings for Bryce, 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 have to head to the marina to scuttle a plot that also puts an unwitting Morgan and Anna squarely in the crosshairs. Meanwhile, It's time for the annual Buy More holiday party, but the party comes with lots of rules from Big Mike.

Captain Awesome asks Chuck if he can have Ellie's hand in marriage, and then insists Chuck holds on to the ring until he plans it all out. Chuck decides to lock it in his Buy-More locker, and returns the next day to discover everything had been stolen from the store. Meanwhile, Agent Casey and Agent Walker discover that the CIA has been spying on them in hopes of discovering "the intersect." With Chuck's identity and life on the line, NSA has no other option than to relocate Chuck into a permanent holding cell. Will Chuck lose his family and friends forever?