After his intuition is wrong while working on a stakeout, Chuck feels morally obligated to make things right, even when both Sarah and Casey refuse to help with Chuck's new mission. Meanwhile, Morgan has to participate in a sales competition that could decide his fate at Buy More.

Not all of Sarah's feelings for Chuck may have been a cover, as she finds out, when Chuck begins to date Lou, a sandwich maker. When things couldn't get even more complicated, Lou turns out to be part of a smuggling ring.

Bryce Larkin returns to town with news about Fulcrum. They have hired a wealthy software magnate named Von Hayes to decrypt information on a stolen chip containing a refresh to the Intersect with highly classified information. Bryce and Sarah have to pose as a married couple at Von Hayes' dining party to steal back the chip, while Chuck has to pose as a waiter. Meanwhile, Morgan has an encounter with the Mighty Jocks at the Buy More.

Christmas Eve does not go as planned when an amateur criminal on the run from the police crashes into the Buy More and takes Chuck, Ellie, Awesome and the rest of the Buy More gang hostage. In order to protect Chuck’s cover and the safety of the other hostages, Sarah and Casey secretly go in to the store to remove Chuck, but the mission quickly falls apart when Chuck refuses to leave his friends and family behind.

Chuck gets jealous when Sarah has to seduce a Fulcrum agent. Meanwhile, Jeff and Lester start looking for the "Buy More Babe" as a way of finding a new employee.

After Chuck's father Steve is kidnapped by Fulcrum, Chuck learns the only chance he has to find him is by putting his trust and life into the hands of the person he trusts the least—his ex-girlfriend Jill Roberts. Meanwhile, the Buy More team tries to sabotage Emmett’s corporate evaluation.

Chuck gets a new mission when Sarah's best friend Carina comes through town with her fiancé Karl. Things get complicated when Chuck wants to hash out his and Sarah's relationship problems while they're on the mission. Meanwhile, Morgan finds himself in trouble when he lies to Jeff and Lester.

Chuck juggles his two lives as he trains new Nerd Herder Hannah and gets his very own asset who is caught up with The Ring. Chuck thinks he can handle his asset all on his own but Sarah and Casey feel the need to intercede. Meanwhile, Awesome must lie to Ellie when she starts to ask questions about Chuck and Morgan, Jeff and Lester do some recon work to learn more about Hannah.

Chuck feels like his life is falling apart when he can't flash and gets left behind for a mission. While Shaw, Sarah and Casey go on without him, Chuck finds himself in a sticky situation back at the base.