Karen Lew

As Meredith nervously awaits a final decision from Derek, her angst is interrupted when a train crash brings several seriously injured patients to the hospital, including Bonnie and Tom, a pair of passengers who've been impaled on a metal pole. And Addison Shepherd sees great potential in Izzie, who must decide whether her loyalty as Meredith's friend outweighs professional gain.

The team tracks an arsonist through a radical environmental group that uses fire to spread its message.

Ted and Victoria must choose the next step in their relationship and Robin is hesitant to break up with Nick, Barney takes matters into his own hands

Sheldon fears the worst when a little girl goes missing from the ER, meanwhile Addison and Jake have a disagreement about one of his patients.

When the young daughter of a prominent family is assaulted at a carnival, the Sons of Anarchy take the law into their own hands.

When old bones are discovered on the outskirts of Charming, Clay is forced to deal with secrets he buried long ago.