S05E17Grey's Anatomy season 5 episode 17: I Will Follow You Into the Dark
Aired 12 March 200943 minRated TV-14
Where to watch Grey's Anatomy Season 5 in Australia
Grey's Anatomy season 5 is streaming in Australia on Disney+ (subscription, listed for the whole show).
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Availability checked 16 November 2026.
What happens in “I Will Follow You Into the Dark”
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 summary: TMDB.
Before you watch
- It is episode 17 of 24 of season 5, so watch episodes 1 to 16 first.
- It runs about 43 minutes.
- Directed by Rob Corn, written by Jenna Bans.
- TMDB users rate it 8.3 out of 10 (16 votes).
Grey's Anatomy trailer
The official trailer for the series (no preview of this episode has been published).
Play video: Grey's Anatomy trailer
Cast and crew of this episode
- Director
- Rob Corn
- Writer
- Jenna Bans
- Guest stars
- Jessica Capshaw as Arizona RobbinsLoretta Devine as Adele WebberGloria Garayua as Intern GraciellaMark Saul as SteveWendy Hoopes as Tricia ShelleyErin Cahill as Megan ShelleyMichael Rady as Michael ShelleyCandice Afia as Intern Laura
Credits: TMDB.
More from Grey's Anatomy Season 5
Every episode of Season 5Grey's Anatomy episode guide
Episode names, air dates, runtimes, stills and ratings: TMDB. Air dates are the first broadcast anywhere; where it streams is our daily Australian check.