Below are photos from the October 7 episode of Grey's Anatomy, "Superfreak." For images from this coming week's episode, "Shock to the System," check out this photo gallery.

The following episode serves as a crossover of sorts with Private Practice. Derek receives an unexpected and unwelcome visit from his estranged sister, Amelia (Caterina Scorsone).

As Caterina herself recently teased, there are many issues between the siblings - both past and present - that come to the surface. Here's a look at the siblings' awkward reunion:

This should be interesting, to say the least. Meanwhile, Richard tries to help out Alex when he notices that he's refusing to use the elevators after his near-fatal shooting; and Meredith and Derek continue their efforts to ease Cristina back into surgery after her PTSD.

Click to enlarge many more photos below ...

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