Catherine Avery returns to Grey's Anatomy. "One Step Too Far" airs March 15, 2012.
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Cristina wears a quizzical expression in "One Step Too Far" airing March 15, 2012.
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A tense moment on Grey's Anatomy. Summer Glau guest stars on "One Step Too Far" which airs March 15, 2012.
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Summer Glau on Grey's Anatomy. "One Step Too Far" airs March 15, 2012.
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Sandra Oh as Cristina Yang on Grey's Anatomy. "One Step Too Far" airs March 15, 2012.
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Will Mer work with Derek again on Grey's Anatomy?
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A tense moment on Grey's Anatomy. "One Step Too Far" airs March 15, 2012.
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Summer Glau guest stars in a scene from the March 15, 2012 episode of Grey's Anatomy.
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Grey's Anatomy Season 8 Episode 17 Quotes

Alex: I felt bad that I had to sit with you all night so you didn't cry yourself to sleep over your sad premie.
Morgan: He has a brain bleed!

We're trained to be vigilant, to chase down the problem, to ask all the right questions, to find the root cause until we know exactly what it is and we confront it. It takes an extreme amount of caution or we can't overstep ourselves. We can create problems that don't exist.

Meredith