'Chuck' Season 4 pics: Olivia Munn joins the Nerd Herd

Here's a nice way to end the week: Zap2it has your first look at images from the Season 4 premiere of "Chuck." Take a look at Chuck Bartowski ( Zachary Levi) and the newest member of the Nerd Herd, guest star Olivia Munn:

chuck-olivia-munn2.jpgFrom the looks of things, the Burbank Buy More has recovered after being leveled at the end of last season -- most likely with a big assist from the CIA. As Levi told us a few weeks ago, the agency has taken over running the store, which is going to present a few challenges of its own as the season progresses.

Munn, meanwhile, is playing a CIA officer code-named "Greta" -- a role that will change throughout the season and provide the opportunity for more guest casting ( Stacy Keibler and Isaiah Mustafa of Old Spice commercial fame are playing future Gretas).

Munn's character will try to blend in at the Buy More, which also means she'll encounter Morgan ( Joshua Gomez). We can't wait to hear the dialogue that goes with this shot:

chuck-olivia-munn1.jpg"Chuck" premieres Monday, Sept. 20 on NBC. What do you think of Munn in Nerd Herd gear? And what's Chuck doing in a suit?

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Photo credits: Warner Bros. TV/Jordin Althaus