Grey’s Anatomy - Season 5 Episode 17
Seasons & Episodes
Episode Overview
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.\”
Episode Details
Airdate: 2009-03-12
Episode Title: I Will Follow You Into the Dark
Director: Rob Corn
Episode Rating: 8.5 (1532 votes)
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