Videos

Izzie and Cristina discuss the former's options in an emotional sneak preview of "Stand By Me," the March 19, 2009 episode of Grey's Anatomy.

Meredith and Derek in an emotional, upsetting scene from "I Will Follow You Into the Dark," from the fifth season of Grey's Anatomy.

Lexie and Izzie in a great scene from "I Will Follow You Into the Dark," from the fifth season of Grey's Anatomy.

A fourth sneak preview of "I Will Follow You Into the Dark," from the fifth season of Grey's Anatomy.

Another preview of the Grey's Anatomy episode of "I Will Follow You Into the Dark," airing March 12, 2009 on ABC.

A sneak peek at "I Will Follow You Into the Dark."

A promo of "I Will Follow You Into the Dark" from the fifth season of Grey's Anatomy.

A sneak preview of "I Will Follow You Into the Dark" from the fifth season of Grey's Anatomy.

Another scene from "An Honest Mistake," in which Izzie finds out that someone else may have a terrible illness, not the woman she misdiagnosed.

A scene from "An Honest Mistake," in which Mark and Derek come to blows in front of everyone at Seattle Grace.

Here's Ellen Pompeo on The Late Show with David Letterman, February 16, 2009.

A final preview of "An Honest Mistake," which originally aired February 19, 2009 in the fifth season of Grey's Anatomy.