Life in espionage takes its toll on Chuck and everyone is taking notice. Chuck tries to explain his unusual behavior to Ellie and to the quirky Buy More efficiency expert Emmett Milbarge (Tony Hale), but a new assignment only complicates things. After a global terrorist comes searching for Jeff, Chuck is forced to socialize with Jeff in order to find out what role the oddball plays in the mission. Sarah, Casey, and Chuck are all shocked when they discover that the fate of the world and the prevention of World War III rest in Jeff's hands and his ability to play the video game Missile Command, of which Jeff is the reigning World Champion. The designer of Missile Command is found to have also forayed into the command of actual missiles, and he had hid the launch codes to actual missiles within the video game. Chuck convinces Jeff to play an exhibition of Missile Command at the Buy More; however, when Jeff collapses under the pressure, Chuck is forced to play in his stead. Casey is ordered by General Beckman to launch an ICBM to destroy the satellite carrying the terrorist-controlled missiles, while Sarah drives to the TV station from which the terrorists are controlling the missiles. Chuck flashes and learns that Rush's song "Tom Sawyer" is the key to beating Missile Command. After finishing the game and recovering the launch codes, he phones Sarah with the information and the terrorist missiles are stopped. Chuck receives his degree from Stanford after Sarah and Casey use his field experience to supply the remaining needed credits.
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