Samira does her best to keep Whitaker on the right track. A teen overdose sparks conflict in the ER.

While Robby attends to an elderly patient with ties to Pittsburgh's history, other members of the team attempt to resuscitate a young drowning victim.

When dozens of critical patients flood the ER, Robby and his team struggle to keep up amid quickly diminished supplies.

As the night shift begins, Robby refuses to give up on a mass casualty victim. Samira and Santos each attempt risky moves.