Regi Davis

While undergoing aggressive cancer treatment, Izzie focuses on planning Meredith and Derek's wedding; Callie's father visits; Owen seeks help with his PTSD.

All reassess their personal lives after witnessing a chance reunion between two long-lost lovers in the emergency room; Karev treats a troubled teen (Demi Lovato); Meredith shares her suspicions with Cristina.

Trip becomes pregnant after being dispatched to an alien ship where he has a close encounter with one of the ship's engineers.

Beckett is asked to assist with a narcotics investigation; when a routine undercover operation goes awry, Beckett is faced with dangerous men from the New York underworld.

Lilly won't let Miley pay for her class trip to Washington and instead has a sale to raise the money.

After learning that his father is in prison for doing business with the old Iraqi government, Michael decides to wash his hands of the whole family and leave town for good.