Chuck accidentally runs into a fellow government agent who seems to be living a similar life. It turns out this agent is a gadget whiz, whose brain makes him a national security asset and a dangerous liability, much like Chuck. Chuck faces a predicament whether he should help turn this agent into Sarah and Casey or help this agent escape his handlers. Meanwhile, Halloween, a holiday that means a lot to Chuck and Morgan as buddies, proves to be a little different this year as Morgan feels that Chuck is neglecting both their childhood and friendship.