Chuck Season 1 Episode 8

A spy after nuclear secrets poisons a scientist to obtain the information. But when scientist collapses on the street, he discreetly passes the chip on to Ellie. Then the spy goes after Ellie poisoning her. As team Chuck sets a trap for him, they all get exposed to the poison. Now they all need the cure. The poison compels them to tell the truth, which creates a dangerous situation for Chuck and Sarah.