Things get off to a deceptively light-hearted start as popular professional wrestler Kornberg (Nils Allen Stewart) is brought into the ER with a twisted knee. But the story quickly turns deadly serious when, stuck in the middle of a street riot, Carter (Noah Wyle) is forced to man the wheel of the paramedic ambulance -- and in so doing sparks an even worse situation when he accidentally runs over a youngster. Meanwhile, Carol (Julianna Margulies), still mooning over the departed Ross, receives confirmation of her pregnancy. And Lucy (Kellie Martin) comes face to face with an intransigent Asian family who refuse to let their mother know that she is in dangerously declining health. ~ Hal Erickson, Rovi