Chuck is an American television series developed by writer/producers Josh Schwartz and Chris Fedak and is broadcast by NBC. 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. During the series he is protected by CIA agent Sarah Walker (Yvonne Strahovski) and NSA agent John Casey (Adam Baldwin) while helping the CIA and NSA in spy missions.