First, Hot Look: Olivia Munn on Chuck Season Premiere

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The guest star heavy fourth season of Chuck gets underway on September 20... in gorgeous fashion.

Olivia Munn comes aboard the NBC series in the role of CIA operative Greta, a role that will actually change throughout the season and later be played by Stacy Keibler and Isaiah Mustafa.

In the premiere pics below, it's clear the Burbank Buy More has recovered from last season's events, thanks to help from the CIA, which will be running the store this fall. Check out a couple photos from "Chuck vs. the Anniversary" and visit our Chuck spoilers section for a more thorough look at season four:

Olivia Munn on Chuck
Munn as Greta

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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Chuck Quotes

(Chuck sees Jill and ducks under the table)
Associate: Is there a problem?
Chuck: Can you tell me if the attractive brown-eyed, slightly egg-headed brunette with an extremely cold heart is still there?
Associate: She's here. Why? Who is she?
Chuck: Jill Roberts, my ex-girlfriend. She broke my heart. I need, I need a diversion. Would it be a terrible imposition for you to pull the fire alarm?

Casey: You didn't wet yourself this time. That's an improvement.
Morgan: I didn't drink any water today.

Chuck Music

  Song Artist
Wait it out Wait It Out Imogen Heap iTunes
Black and gold Black and Gold Sam Sparro iTunes
Just dropped in to see what condition my condition is in Just Dropped In (To See What Condition My Condition Is In) Kenny Rogers iTunes