Bilson's playing Lou, a potential love interest for Chuck (and barrier to any sort of legit Chuck-Sarah romance, presumably). From this first clip of Lou meeting Chuck when she brings her cell phone into the Buy More for a repair, she looks to be just as lovably neurotic as I'd hoped. And she's obsessed with sandwiches! How cute is that? Even Morgan calling Chuck a "mind-cheater" cracked me up.
Pop has some more pictures of Bilson's Chuck debut, and to watch a clip from the episode and start your squealing now, just
Photo courtesy of NBC