Hugh Holub

Meredith feels left out when Derek breaks ground on his clinical trial; Bailey's new idea does not go over well with the Chief; Callie irritates her new obstetrician (Rachael Taylor).

Alan tries to avoid bringing his sexy 22-year-old girlfriend to Jake's birthday party.

The team must stop a gang of suspected murderers that is targeting a new victim nightly.

In the sixth season premiere, when it appears one of the Boston Police Department's own has shot an unarmed man on a busy Boston subway platform, the team must fight to find the real killer while exonerating the detective's name. But with Internal Affairs breathing down their necks, it becomes apparent that the circumstances surrounding this shooting are anything but clear.

Emily continues to delicately weave her way back into the Graysons' lives while keeping her ties to Amanda and her unborn child.

Melinda gives birth to a son who has apparently inherited her gift for seeing spirits, though his gift has an important difference.