The worsening storm overwhelms the ER, forcing Danny to make tough choices. Tom must rise to the occasion when someone close to him is injured.

As the hospital's backup generators run low, Dr. Cruz worries for Vero's safety. Sophie and Camila risk it all to save a patient in danger.

A charismatic sheriff's deputy sets his sights on Danny. A young patient's demanding parents make things hard for Harper. Sophie faces a moral dilemma.

Xander comes clean about what really happened at his former hospital. A new academic year brings a new chief resident — and new challenges in the ER.