On this week's episode of Grey's Anatomy, Derek must help save the hospital's own lab technician, Isaac, when it turns out that he has an inoperable tumor surrounding his spine.

McDreamy finds himself juggling two things at once as he also questions Richard's authority.

"Give Peace a Chance" is Chandra Wilson's directorial debut, and has Patrick Dempsey's character front and center throughout. Click to enlarge photos from the episode below ...

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