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.

Cast: Zachary Levi, Yvonne Strahovski, Joshua Gomez, Ryan McPartlin, Mark Christopher Lawrence, Vik Sahay, Scott Krinsky, Sarah Lancaster, Adam Baldwin, Bryan Friday, Brandon Routh