Season 4 begins with Chuck and Morgan jobs and travel around the world in search of Chuck's mother, Mary Elizabeth Bartowski (Linda Hamilton), and then meet with the CIA, despite the initial discomfort with Chuck Ellie risking his life at work as a spy. Chuck and Sarah are still communication problems, and the search for Chuck to her mother entangled in a fight with Russian international arms dealer Alexei Volkoff (Timothy Dalton) and his powerful organization Volkoff Industries, who was assigned to infiltrate 20. Throughout the season, Chuck and Sarah to solve their communication problems, trying to figure out where Mrs. Bartowski loyalties really lie. Because knowing erased the intersection of Chuck's brain (using a program located on a PlayStation Portable), which is supposed to be a rogue agent, but further aid in the orchestration of Chuck and Sarah escape a deadly situation makes once again the question of his motives. In the episode "Chuck Versus the leftovers", Chuck regains the use of the intersection when activating a laptop found in the back of a car was to Ellie by her father. At the end of "Chuck Versus the Balcony", Sarah tells Chuck goes undercover as a double agent to reduce Industries Volkoff and bring back Mary Bartowski.
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