When Chuck go undercover in Milan, Chuck realizes the "Achilles‘ Heel" in their relationship, but must set personal issues aside for the mission. Meanwhile, Morgan recognizes a fatal flaw that compromises the new Buy More. Elsewhere, Casey struggles to put down roots in Burbank.

It‘s fashion week, dahlings! Read on about this week‘s tres chic episode.Strut Your StuffAn agent‘s death leads Sarah and Chuck on a mission to Milan Fashion Week. Their target: Sofia Stepanova (guest star Karolina Kurkova). She‘s a supermodel by day and a spy by night as she executes many of Volkoff‘s weapons deals.
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