Chuck

Chuck and Morgan go on a rogue globe-spanning mission to find Chuck’s mom. Meanwhile, Sarah and Casey follow a trail to Russia as they investigate the mysterious Volkoff Industries and its operative, Marco. Back at home, Ellie delivers big news to her family.

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.

Chuck and Sarah's romantic mission is canceled with the arrival of Hugo Panzer and Heather Chandler. But Chuck grows more interested when the manipulative Heather claims to know a secret about his mom. Meanwhile, as Morgan prepares the Buy More for a huge video game release, he gets a surprise from Big Mike.

Chuck and Sarah try to become better communicators as they join Ellie and Awesome on a trip to Costa Gravas; a forbidden romance may put Morgan at odds with Col. John Casey.

When Colonel Casey's former team returns looking for him, Chuck must decide what he's willing to sacrifice in order to find his mom. Elsewhere, Morgan works up the nerve to reveal a potentially dangerous secret to Casey.

Chuck, Sarah, Casey and Morgan must stop Dr.Stanley (Robert Englund) from releasing a toxin that induces nightmares... Chuck's mother's allegiances are questioned; Lester and Jeff celebrate Halloween at the Buy More.