NBC has picked up nine additional episodes of its sophomore drama "Chuck" (Mondays, 8-9 p.m. ET) to provide the series with a full-season order for 2008-09.

"Chuck" premieres its new season on Monday, September 29 (8-9 p.m. ET).

The world's nerdiest secret agent is back as executive producer Josh Schwartz and executive producer-director McG team up again to bring back the action-comedy series about Chuck Bartowski -- a computer geek who is catapulted into a new career as the government's most vital secret agent.

When Chuck opens an e-mail subliminally encoded with government secrets, he unwittingly downloads an entire server of sensitive data into his brain. Now, the fate of the world lies in the unlikely hands of a guy who works at a Buy More Electronics store. Instead of fighting computer viruses, he must now confront assassins and international terrorists.

With the government's most precious secrets in Chuck's head, Major John Casey of the National Security Agency resumes his responsibility of protecting Chuck. Casey's partner is the CIA's top agent (and Chuck's dream girl), Sarah Walker. Also starring are Joshua Gomez as Morgan Grimes -- Chuck's best buddy, Sarah Lancaster as Chuck's ever-supportive sister, Ellie, and Ryan McPartlin as "Captain Awesome," Ellie's fiancé. Chuck's Buy More team consists of Big Mike (Mark Christopher Lawrence, "The Pursuit of Happyness") and the Nerd Herd, which includes Lester, Jeff and Anna.