Arlene Santana

Vance gets news from the Pentagon.

Sam's former partner, Ruiz, goes missing while buying an explosive during an undercover operation.

The CSI team investigates the eccentric world of sideshows when a couple of performers are discovered burned in a pit; Hodges mulls a plea deal as his criminal trial begins.

When a burn victim unexpectedly dies in the ER, all the Mercy West and Seattle Grace residents must defend their actions in hope of saving their jobs.

Amelia arrives at Seattle Grace to beg Derek to help with the gliosarcoma case; Cristina and Owen have heated arguments during marriage counseling; Alex realizes he needs to improve his people skills in order to be a good doctor.

Owen is faced with tough decisions as Seattle Grace spirals toward financial ruin; Jo and Alex try to save an infant's life; April turns to Jackson for dating advice.