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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Episode Details: Grey’s Anatomy Season 5 Episode 17
| Title | I Will Follow You Into the Dark |
| Episode | 17 |
| Season | 5 |
| Release | March 12, 2009 |
| 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." |
| Rating | 7.8 |
| Vote Count | 8 |
