 In the course of events, Chuck unravels mysteries from his life before the series, often dealing with the Intersect, such as why his parents left, why Bryce got him kicked out of Stanford, and why he's unusually suited for the Intersect.Meanwhile, Casey and Sarah confront unresolved issues from their lives before the series, including their families, Sarah's history with Bryce, and the spies they previously worked with.And as Chuck grows more comfortable with his own role, those closest to him are gradually drawn into his spy life.