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The ERs and ORs of prestigious Boston hospitals attempt to save two young men after they've been gunned down in Charlestown. Elsewhere, a nursing student is involved in a car accident in which the other driver is also a nurse and an injured motorcyclist raps for the doctors and nurses.

A horrific motorcycle accident involving an off-duty firefighter is caught on camera; a teenager falls through floorboards in a church; Boston Garden EMS personnel deal with a contentious sports fan; a volleyball player with a dislocated ankle.

A teen whose hand was severed in a car accident is taken to Massachusetts General Hospital to have it reattached; a firefighter falls from the roof of a burning building; a young man takes a bullet to the chest.

A car hits a medical student who is out biking; a woman with a latex allergy has a reaction after eating food prepared by workers wearing rubber gloves; an ER doctor keeps his cool when a patient becomes aggressive.

A man suffers internal injuries after a fall from a ladder; a woman is trapped underneath a subway; a man suffers a stab wound and refuses to be cut open.

Orthopedic doctors try to repair a rock climber's broken foot; a man wounded by a knife-wielding assailant is unexpectedly calm; a man trying to prevent his wife from falling down a flight of stairs ends up falling with her.