I Will Follow You Into the Dark

Grey's Anatomy

S05E17
E17
March 12, 2009 ★ 8.3 43 min

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."

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Ellen Pompeo

Ellen Pompeo

Meredith Grey

Chandra Wilson

Chandra Wilson

Miranda Bailey

Sandra Oh

Sandra Oh

Cristina Yang

Justin Chambers

Justin Chambers

Alex Karev

James Pickens Jr.

James Pickens Jr.

Richard Webber

Patrick Dempsey

Patrick Dempsey

Derek Shepherd

Kevin McKidd

Kevin McKidd

Owen Hunt

Katherine Heigl

Katherine Heigl

Izzie Stevens

Sara Ramirez

Sara Ramirez

Callie Torres

Eric Dane

Eric Dane

Mark Sloan

Chyler Leigh

Chyler Leigh

Lexie Grey

T. R. Knight

T. R. Knight

George O'Malley

Guest Stars

Jessica Capshaw

Jessica Capshaw

Arizona Robbins

Loretta Devine

Loretta Devine

Adele Webber

Gloria Garayua

Gloria Garayua

Intern Graciella

Mark Saul

Mark Saul

Steve

Wendy Hoopes

Wendy Hoopes

Tricia Shelley

Erin Cahill

Erin Cahill

Megan Shelley