When an ordinary computer geek accidentally downloads a database of government secrets into his brain, he is forced into a dangerous double life as a vital intelligence asset protected by two elite handlers. Having become the most important asset of the U.S. government, Chuck is under the constant surveillance of agents Sarah Walker and John Casey, who remind him that he cannot reveal his spy life to his sister Ellie, nor his best friend Morgan.
Balancing high-stakes spy operations with his mundane job at the Buy More, Chuck must protect his unsuspecting family and civilian relationships while navigating a complicated, blurring cover romance with Sarah.
Chuck’s normal life is turned upside down when a mysterious email from an old friend loads stolen government secrets into his brain, putting him in the middle of a CIA and NSA operation.
The government sends in its top scientist to extract the intersect from Chuck’s brain, but explosive events leave him unsure whether he can trust Casey or Sarah.
After his intuition is wrong while working on a stakeout, Chuck gets drawn into a rescue mission involving the triads. Morgan must participate in a sales competition that could decide his fate at Buy More.
On Halloween, Chuck’s attempt to juggle his spy life, a Buy More promotion, and his friendship with Morgan is complicated by an encounter with a brilliant government inventor on the run.
After the unexpected return of an old friend, Chuck learns that a renegade group within the CIA is after the Intersect - which Chuck has to balance with the year's busiest shopping day at the Buy More.
While acting as a married couple for a high-society sting operation, Chuck and Sarah must stop a corrupt billionaire’s counterfeiting operation - which sees Morgan and Anna in the cross hairs.
When a hostile spy bug at the Buy More threatens to expose Chuck as the human Intersect, the team faces a frantic race against time before the government locks him in an underground bunker forever.