Grey's Anatomy Scoop: Summer Glau Checks In

Winter’s not even half over yet Grey’s Anatomy already has Summer on the brain.

Summer Glau, that is.

The actress — whose cult fave-packed resume (Firefly, Dollhouse, Sarah Connor Chronicles) has made her goddess of fanboys everywhere — will guest star in an upcoming episode of Grey’s, series creator Shonda Rhimes announced on Twitter late Monday.

Details about Glau’s character are forthcoming.