Overview: A mountain lion attacks a young woman.
Overview: A jewelry shop owner undergoes open-heart surgery after being shot during a robbery.
Overview: Dr. Keller thinks a boy struck by a baseball bat has a concussion, but a CT scan reveals massive brain bleeding, and he suffers kidney failure.
Overview: An 11-year-old girl has streptococcal pneumonia, which has a high fatality rate.
Overview: A tornado slams a fence picket into a woman's head.
Overview: A 7-year-old boy undergoes surgery to reattach his left arm after it was severed in a truck accident.
Overview: A teenager rushes to the ER after a football game.
Overview: A skier hits a tree at 50 mph.
Overview: An automobile accident critically injures a driver.
Overview: A stack of drywall collapses on a young boy.
Overview: A crazed gunman storms a large metropolitan hospital and opens fire in the ER.
Overview: A car accident ejects a young boy from a vehicle.
Overview: A team of doctors tries to save a patrol officer's life.
Overview: A rattlesnake bites the 2-year-old son of a snakebite expert.
Overview: A ruptured brain-aneurysm threatens the life of the ER's medical director.
Overview: A surgical resident puts her training to the test when a mugging survivor arrives with two bullet wounds.
Overview: A seemingly healthy baby suddenly develops an oxygen deficiency.
Overview: A construction worker's skull has a 4-pound hook embedded in it and a trauma surgeon struggles to extract it without killing him.