In this season 3 premiere Carina returns and emotions get in the way when Chuck gets assigned with a new mission with Sarah.

When Carina is back in town, Chuck is assigned to a new mission with Sarah, but his emotions come in the way

Chuck and Sarah train under the tutelage of a married CIA team (Fred Willard and Swoosie Kurtz), who have a glowing record together but despise one another. In another training mission, Casey must show the spy ropes to an unlikely student—Morgan.

Chuck and Sarah are assigned to train under Craig and Laura Turner a married CIA team who, despite their impeccable record, hate one another. The Turners’ stormy relationship forces Chuck and Sarah to wonder if they’re doomed with the same fate. Meanwhile, Casey must train the newest member of the team—Morgan.