Unbeknownst to his parents (CYNTHIA STEVENSON & DANIEL ROEBUCK) or younger brother, Alex (CONNOR WIDDOWS), 16-year-old Cody Banks (FRANKIE MUNIZ) is an undercover agent working for the C.I.A. While they believe he's away at a normal summer camp, Kamp Woody is really a covert training facility for young agents run by veteran spook Victor Diaz (KEITH ALLEN).
While he disappears during what appears to be a simulation, the C.I.A. director (KEITH DAVID) informs Cody that he's actually flown the coop with top-secret, mind-control software. With the aid of arts benefactor Lord Duncan Kenworth (JAMES FAULKNER), Diaz plans on gaining control over various world leaders.
Accordingly, the director assigns Cody to go undercover and stop the two before they take over the world. Arriving at Kenworth's London estate, Cody poses as a musical prodigy, along with other students such as Emily (HANNAH SPEARRITT), under the tutelage of conductor Isambard Jerkalot (JULIAN FIRTH). The only problem is that the junior agent has no idea how to play his clarinet.
For better or worse, he's aided by C.I.A. flunky Derek Bowman (ANTHONY ANDERSON) and his driver, Kumar (ROD SILVERS), and the small group of spies tries to uncover the villains' plans. As the latter go about their megalomaniacal efforts via dental assistant Santiago (SANTIAGO SEGURA), and Kenworth's wife, Josephine (ANNA CHANCELLOR), remains oblivious to what's occurring under her nose, Cody and his team set out to link Diaz and Kenworth together and stop them.