A mission in Japan gets derailed when Chuck and Sarah face off against menacing evildoer Nicholas Quinn on a speeding bullet train. Elsewhere, Casey must make a monumental decision.

A mission in Vail, Colo., involves Morgan facing fallout from being the Intersect and the gang receiving help from an unlikely source: Bo Derek (playing herself). Meanwhile, Jeff and Lester go deeper into their own spy operation. Angus Macfadyen guest stars

Chuck and Sarah mull over the next phase of Carmichael Industries. Meanwhile, Casey gets more deeply involved in his forbidden romance with Gertrude Verbanski (Carrie-Anne Moss), who offers a shadowy assignment in South Beach. And an intellectually elevated Jeff scrutinizes oddball happenings at Buy More

An undercover mission spins around an extreme computer virus, an oddball cult and Chuck’s hacker past. The task also forces Chuck to reach out to rival Gertrude Verbanski (Carrie-Anne Moss) for help. Meanwhile, a new Buy More staffer arrives and adds a new dynamic to Jeff and Lester’s bond. Zachary Levi directed the episode.

Mystery deepens at a Buy More sales convention when Chuck and Sarah must unmask an assassin lurking among the conventioneers. Meanwhile, Intersect complications affect Morgan; and Jeff shows there’s more to him than just being a “Buy Moron.” David Koechner and Catherine Dent guest star

While the team searches for one of the CIA’s most wanted, Chuck worries about the Intersect’s effect on Morgan; Sarah gives Casey relationship advice; Captain Awesome makes a revelation about Jeff and Lester.

Season 5 opens with Chuck adapting to changes, such as dealing with an unlikely new Intersect and fronting his freshly minted spy-for-hire business. Carmichael Industries takes on a wealthy thief (Mark Hamill) and a sly investor (Craig Kilborn). Meanwhile, Morgan and Chuck team up to give Sarah a special surprise; and Jeff and Lester launch [...]