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Chuck begins having nightmares when the Intersect starts messing with his head and the CIA has him committed with guest start Christopher Lloyd as his psychiatrist.
Chuck and Sarah must train with the best spy couple ever, the Turners (Fred Willard and Swoosie Kurtz); Casey must train Morgan.
Chuck and Sarah pose as a married couple on their honeyoon as they attempt to go AWOL from their spy lives together.
Chuck and Sarah join Shaw on a mission to catch the Ring director that had Sarah kill his wife.
Chuck is determined to get Sarah back and when a CIA mission comes up where he gets to pick his choice of agent, he chooses Walker.
Chuck is given a final exam that if he passes will make him a full-fledged spy; Casey adjusts to civilian life.
Casey is put on a side mission by his former boss gone Ring operative, James Kellar (Robert Patrick) and Casey and Sarah end up helping him commit treason.
When Chuck has problems flashing, he's left behind during a mission. With Sarah, Casey and Shaw gone, The Ring invades Castle.
Chuck pretends to be an assassin, Rafe Gruber, hired by the mafia (Tony Sirico and Louis Lombardi) to kill Shaw.
Chuck must help Shaw steal the Mask of Alexander; Ellie and Morgan follow Chuck to figure out his secret.