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Season 5 Episode 17
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Season 5 Episode 17
I Will Follow You Into the Dark
Mar 12, 2009 on ABC at 9:00 PM
Summary
Derek decides to quit after learning that more of his patients have died than survived; Izzie's interns make an unsettling discovery about "Patient X."
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Guest stars
Brandon Scott, Erin Cahill, Jessica Capshaw, Loretta Devine, Michael Rady, Susane E. Lee, Wendy Hoopes
