Kristen Ariza

Monica exults in the applause she receives on karaoke night, unaware that the cheering audience can see through her blouse.

Sylvester ends up in critical condition after accidentally triggering an explosion during an investigation, but the team must remain focused on finding the culprit.

When Thatcher returns to the hospital with a failed liver, Meredith must save his life; Izzie empathises with a tumour-riddled patient; annoyed with Cristina's competitive zeal, Mark tricks her into assisting on an unusual surgery.

The BAU team head to rural Oklahoma as women are being found murdered and robbed of one of their five senses. Meanwhile, JJ and Prentiss get the cold shoulder from Reid.

The son of devout Jehovah's Witnesses is accused of killing his teacher after being caught fleeing the scene of her murder; the Democratic National Committee hires the team to investigate a second case.

The team is involved in an international incident as they investigate the murder of an American petty officer, whose body was found aboard a British ship.