Regi Davis

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

Izzie continues helping to plan Derek and Meredith's wedding in spite of her cancer treatments; things don't go smoothly when Callie introduces Arizona to her father; Owen seeks out help for his post-traumatic stress disorder.

With Gideon missing and Hotch and Prentiss off the team, the BAU tackle one of their trickiest cases, a Milwaukee serial killer who uses his son as bait to ensnare women in broad daylight.

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.

Lilly won't let Miley pay for her class trip to Washington, and has a sale instead. She's angry when Miley pays people to buy stuff.

Michael collapses and must go to the hospital, Sucre steps on a landmine, Mahone meets up with Scylla's designer, and Trishanne has a surprising secret.