Sarah from CIA and John from NSA fight and suspect each other for killing "The Doctor" after he checked out Chuck. Sarah and Chuck are invited to dinner at his sister's.
The Government wants to verify the secrets are inside Chuck's head. So they send a doctor who programmed the Intersect system to examine Chuck. When the doctor's car explodes, there's evidence one of the agencies was involved, leaving Chuck unsure whom to trust.—Jesse Sanchez