S5·E17 I Will Follow You Into the Dark
Aired March 12, 2009
Synopsis
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."
Aired March 12, 2009
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."