The title character of the series is Chuck Bartowski (Zachary Levi), an affable and anxious Nerd Herd associate at Buy More who unwittingly downloads the entire CIA/NSA secret database subliminally into his brain.
[13] FULCRUM is the codename of a hostile espionage organization which served as the series' main antagonist, and it was later revealed to be a part of The Ring.
Casey and Sarah had spent several months prior to "Chuck Versus the Anniversary" on assignment attempting to track down the organization, and it has been revealed that Volkoff Industries is somehow tied to the disappearance of Mary Elizabeth Bartowski.
[14] Volkoff's ability to manipulate prison transfers, relationship with Mary, and former connections to the Soviet Union would suggest a far-reaching political power.
Verbanski Corporation is the main competition to Carmichael Industries, the freelance spy organization operated by Chuck and his colleagues, in season 5.