Love the One You're With

The survivors from the crash are asked to make an almost impossible decision that will affect the rest of their lives. Meanwhile, tension grows between Jackson and April after they're forced to work together, and Alex tries to restrain himself with one of the interns.

Music
This episode's title originated from the song , originally sung by Stephen Stills.

Main cast

 * Ellen Pompeo as Dr. Meredith Grey
 * Sandra Oh as Dr. Cristina Yang
 * Justin Chambers as Dr. Alex Karev
 * Chandra Wilson as Dr. Miranda Bailey
 * James Pickens Jr. as Dr. Richard Webber
 * Sara Ramirez as Dr. Calliope 'Callie' Torres
 * Kevin McKidd as Dr. Owen Hunt
 * Jessica Capshaw as Dr. Arizona Robbins
 * Sarah Drew as Dr. April Kepner
 * Jesse Williams as Dr. Jackson Avery
 * Patrick Dempsey as Dr. Derek Shepherd

Guest stars

 * Adina Porter as Dr. Ramsey
 * Gaius Charles as Shane
 * Tina Majorino as Heather
 * Jim Turner as Dr. Schacter
 * Elizabeth Tobias as Boise Chief