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.

While Robby struggles with a loss, Abbott coaches Samira through a risky procedure, and Mel treats a teen with a mysterious rash.

Robby resorts to unorthodox methods to convince a father to allow treatment for his son. Later, Whitaker tracks down a missing patient.

After examining an influencer with strange symptoms, Samira pushes back against Robby. Santos contends with a patient accused of assault.

While Robby handles an ultimatum from the hospital, Mel, Javadi, and Collins each handle unique mother-daughter dynamics.

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.

Robby helps siblings navigate their elderly father's end of life care. Later, Samira fends off cops targeting a woman with a misunderstood condition.

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

Santos and Collins each deal with moral quandaries. Samira’s careful approach earns praise from patients – and reproach from Robby.

While attempting to distract himself from the anniversary of his mentor's death, Dr. Robby introduces a fresh batch of interns to life in the ER.

Bets are taken on the whereabouts of a stolen ambulance, while Santos learns a hard lesson, and Whitaker helps to tame “The Kraken.”

After a staff debrief from Robby, Dana defuses a waiting room brawl, Whitaker finds common ground with "The Kraken," and McKay faces a crucial error.

With the Pitt down a staff member, Robby relies on his team to pick up the slack. Later, Santos finally voices her suspicions.

While Robby tries to keep a developing staffing situation under wraps, Collins guides a surrogate through a difficult delivery.