'Chuck': Do not make Summer Glau angry

summer-glau-chuck4.jpg"Chuck" is off the air next week, but fortunately NBC has given us a little something to while away the days between now and the Nov. 15 episode: Several photos of Summer Glau as the latest Greta.

Glau ("Firefly," NBC's midseason show "The Cape") is the fourth actor to take on the "Greta" role this season, following Olivia Munn, Isaiah Mustafa and Stacy Keibler. Like Munn and Keibler, Glau's incarnation of the code-named CIA operative will use the Nerd Herd as her cover. Unlike her predecessors, though, it appears that she'll interact a little more with the rest of the Buy More crew.

Which may not necessarily be a good thing. According to NBC's description of the episode, the Buy Morons finally get hip to the frequent personnel changes at the store and set out to uncover Greta's real identity. That sends Morgan ( Joshua Gomez) and Casey ( Adam Baldwin) scrambling to keep her cover intact, and we're guessing it also has something to do with her mounting fury in the pictures below.

We're also guessing that the person on the receiving end of Greta's anger is Lester ( Vik Sahay). Jeff ( Scott Krinsky) is in the background of a couple of the shots, so who else could possibly set her off like that?

summer-glau-chuck1.jpg summer-glau-chuck2.jpg summer-glau-chuck3.jpgGlau's episode, "Chuck vs. the Fear of Death," is set to air Monday, Nov. 15. In it, Chuck ( Zachary Levi) tries to compensate for his newly Intersect-less self by taking on a dangerous mission with an off-center agent played by "Daily Show" alum Rob Riggle.

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Photo credits: NBC