Grey's Anatomy

Derek makes a decision to resign as chief and return to surgery.

Meredith finally tells Derek about her pregnancy and miscarriage.

Issues surface when Derek's estranged sister visits unexpectedly.

Derek and Meredith visit the obstetrician and receive disturbing news.

As part of their training, Seattle Grace's residents are put in charge.

A documentary crew visits the hospital six months after the shooting.

Owen puts the residents through a rigorous trauma certification drill.

Doctors try to save the life of a political figure from the Middle East.

Derek and the attendings go out to celebrate.

Concerned about Cristina, Derek tekes her on a fishing trip.

A gunman open fires at a college, sending mass casualties to the hospital.

Arizona tries to reconcile with Callie, who has big news to share.

Meredith feels left out when Derek breaks ground on his clinical trial.

Alex butts heads with the new OB; Mark bribes Jackson for information.

Meredith volunteers to run the ER for a night.

Meredith's fertility treatments start affecting her eyesight.

Richard tries to get Adele into Derek and Meredith's Alzheimer's trial.

A cataclysmic event leaves the doctors shaken;

Everyone tries to help Callie and her baby recover.

Meredith and Derek make a life-changing decision.

Work and personal pressures leave Meredith on edge.

The new chief resident is chosen.