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

Our intentions are always pure. We always want to do what is right, but we also have the drive to push boundaries. So we're in danger of taking things to far. We're told to do no harm while we're trained to cut you open with a knife. So when we do things when we should have left well enough alone. Because its hard to admit when there's no problem to treat, to let it alone before we make it so much worse. Because we cause terrible damage.

Meredith

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!