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; Meredith shares her suspicions with Cristina.

As Brennan and Booth settle back into life at the FBI, a body is discovered at a fish farm. The sinister find leads them to an organ harvesting ring.

Prentiss resigns, Hotch requests a transfer and Gideon goes missing, leaving the team three members short as they hunt a serial killer in Milwaukee, who kidnaps women from public places.

Michael is so smitten with Gob's girlfriend that he decides to let her know that Gob has been cheating on her, and Lucille tries to break up Buster and Lucille Austero.

Beckett is asked to assist with a narcotics investigation and faces dangerous men from the New York underworld.