"He's the human secret weapon. Who gets you a discount on electronics."

It's not very long, but it'll do for the minute. NBC has released a brand new teaser for Chuck's fourth season, which kicks off on 20th September. We've already talked about the upcoming guest stars in the series right here, but to give you a taste of what's to come, help yourself to the 23 seconds of footage that NBC has graciously thrown in your direction...