Larry Clarke

Meredith's fears that she is in for a bad day are realized when a medical case arrives at Seattle Grace that threatens the lives of everyone in the O.R.

Jack and the castaways begin their efforts to make contact with Naomi's rescue ship.

Jack is on his way to the radio tower with some of the survivors to contact Naomi's salvage ship, but Ben warns them that it could kill everyone on the island. He threatens to execute Sayid, Jin and Bernard.

In Providence, a serial killer apparently murdered three people at random. The perpetrator has no specific victim type, but always strikes in crowded places and uses a knife as a murder weapon.

Castle investigates when a juror on the murder trial of a famous socialite dies in the courtroom.

Virginia takes on a job as a house sitter for a teenage girl, and when she learns that the girl plans to have sex with her boyfriend, she decides to dispense some motherly advice. Burt gets involved.