'Chuck': Summer Glau reports to the Buy More

Fans of Summer Glau won't have to wait until midseason to see her on NBC.

NBC confirms to Zap2it that the "Firefly" and "Terminator: The Sarah Connor Chronicles" star will guest on "Chuck" later this fall. As first reported by EW, she'll play the latest agent code-named "Greta" to come to work at the Burbank Buy More, which is now a fully operational CIA/NSA station.

She's the fourth Greta cast so far this season. Olivia Munn played the rotating role in Monday's (Sept. 20) premiere, and Isaiah Mustafa (aka the Old Spice guy) and Stacy Keibler will be Greta in upcoming episodes.

Glau also stars in NBC's midseason drama "The Cape," where she plays a blogger who helps an ex-cop-turned-costumed hero ("ER's" David Lyons) clean up their corrupt city.

We're noticing a pattern with the casting of the Gretas -- none of them are in any way hard on the eyes. Glau fits in pretty well.

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Photo credit: Lifetime