S1, E8: Chuck battles with his real love life and "cover" love life when he meets a very pretty girl named Lou (recurring guest star Rachel Bilson), who seems interested in the real Chuck. On the other hand, Chuck's relationship with Sarah heats up as they go on a double date with Ellie and Captain Awesome (recurring guest star Ryan McPartlin) and try to explain their sex life. Meanwhile, a poison specialist trying to obtain codes to nuclear facilities uses a "truth" potion to help him get answers. After all are exposed to the serum, Chuck discovers a lot about his partners.