Grey's Anatomy Season 5 Episode 17 I Will Follow You Into the Dark ( Air Date 2009-03-12 ) Genre Drama category. 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."".
Grey's Anatomy Season 5 Episode 17 I Will Follow You Into the Dark
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- Watch: Grey's Anatomy Season 5 Episode 17 I Will Follow You Into the Dark on CWR-CRB
- Stars: Ellen Pompeo, Chandra Wilson, James Pickens Jr., Kevin McKidd, Caterina Scorsone, Camilla Luddington, Kim Raver, Jason George, Chris Carmack, Anthony Hill, Adelaide Kane, Alexis Floyd, Niko Terho, Harry Shum Jr.
- Director: Zoanne Clack, Linda Klein, Krista Vernoff, Shonda Rhimes, Betsy Beers, Mark Gordon, Ketty Gonzalez, Nicole Gonzalez, Marcial Gonzalez, Kelly Golden, Natalie Vermiglio, Glen Hall, Glen Hall, Sara Steinberg, John Wesley DeWolfe
