Season 4 Episodes
1. Mountain Lion Attack
A mountain lion attacks a young woman.
2. Shot Through the Heart
A jewelry shop owner undergoes open-heart surgery after being shot during a robbery.
3. Hidden Dangers
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.
4. Deadly Diagnosis
An 11-year-old girl has streptococcal pneumonia, which has a high fatality rate.
5. Code Black
A tornado slams a fence picket into a woman's head.
6. Life and Limb
A 7-year-old boy undergoes surgery to reattach his left arm after it was severed in a truck accident.
7. Liver Die
A teenager rushes to the ER after a football game.
8. Elements of Danger
A skier hits a tree at 50 mph.
9. Deadly Impact
An automobile accident critically injures a driver.
10. Crushed
A stack of drywall collapses on a young boy.
11. Under Siege
A crazed gunman storms a large metropolitan hospital and opens fire in the ER.
12. Family Tragedy
A car accident ejects a young boy from a vehicle.
13. Officer Down
A team of doctors tries to save a patrol officer's life.
14. Too Close to Home
A rattlesnake bites the 2-year-old son of a snakebite expert.
15. Director Down
A ruptured brain-aneurysm threatens the life of the ER's medical director.
16. A Shot in the Dark
A surgical resident puts her training to the test when a mugging survivor arrives with two bullet wounds.
17. Baby Blues
A seemingly healthy baby suddenly develops an oxygen deficiency.
18. Hooked Alive
A construction worker's skull has a 4-pound hook embedded in it and a trauma surgeon struggles to extract it without killing him.