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Summer Glau, Dollhouse

Carin Baer/FOX

Grey's Anatomy is courting the fanboys!

Creator Shonda Rhimes sent the Internet into a bit of a tizzy when she tweeted that Summer Glau, she who is beloved by Joss Whedon (see: Firefly, Dollhouse, etc.), would be making a guest appearance in an upcoming episode.

So who is the Terminator: The Sarah Connor Chronicles alum playing? Here's what we can tell you...

For now, details surrounding Glau's role on the show are unknown, but we're working on it, so make sure to check back here later for all the scoop.

Glau is set to appear on the medical drama 16th episode later this season. Most recently, Glau starred on NBC's short-lived superhero drama The Cape.

Grey's Anatomy airs Thursdays at 9 p.m. on ABC.