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Chuck struggles with his cover love life and his real one when he meets Lou (Rachel Bilson) who actually seems interested in him. Meanwhile, his cover relationship with Sarah heats up when they go on a double date with Ellie and Devon and try to explain their sex life. Meanwhile, a poison specialist (Kevin Weisman) is trying to obtain ocdes to a nuclear facility and is using a truth serum to get what he wants. After everyone is exposed to the truth serum, Chuck learns the truth about his partners.