When does Chuck return?

The series is about an "average computer-whiz-next-door" named Chuck Bartowski, played by Zachary Levi, who receives an encoded e-mail from an old college friend now working for the CIA. The message embeds the only remaining copy of a software program containing the United States' greatest spy secrets into Chuck's brain. The opening theme song is an edit of "Short Skirt/Long Jacket" by the American rock band Cake.