Grey's Anatomy

We have read the description of tonight's episode of "Grey's Anatomy" and it very clearly mentions that sci-fi darling Summer Glau ("Firefly," "Terminator:  The Sarah Connor Chronicles," "Dollhouse") is going to be guest starring tonight.  The thing of it is, the episode summary itself doesn't mention Glau's role at all.  We therefore have to assume that the actress will be playing a cyborg from the future who has had her mind wiped into believing that she's a medical resident on a mission to get hot and heavy with various other doctors in the hospital.  Later in the episode she may have her mind wiped again so that she believes herself to be an orderly, we're just not certain.