Moretti's first day is more than a little challenging: the ER is inundated with casualties from the peace rally - including, shockingly, Neela
Moretti makes his presence felt as he implements changes in the way patients are seen, leading Pratt to complain to Anspaugh. A patient with a seemingly simple stomach ache has much bigger issues.
Pratt quickly tries to solve the problem of a teenage wrestler's severe vomiting. However, he finds out that the cause is much more serious. Gates attempts to help a young kid with a deadly disease.
A patient's mother gives the staff makeovers with interesting results. Meanwhile, Abby is having a bad day and is unable to reach Luka by phone. Gates makes a dream come true for a terminally ill boy.
Moretti decides that Gates has done an impressive job in the intensive care unit and is now ready to return to the emergency room. Morris has a hard time resisting the ladies.
Abby continues to wrestle with her alcohol problem, while Joshua comes back to the hospital with respiratory failure. Moretti brings in a new physician, Skye Wexler, to help with the workload.
A power failure strikes the Emergency Room on an unusually hot day, Moretti and Abby's sparring intensifies, and Abby finds herself at a dark and frightening crossroads
Abby's attitude is drawing attention, Luka returns from Croatia a day early, and Neela's intern makes her proud. Meanwhile, Gates and Julia nurture their newfound romance despite interruptions.
The staff must deal with changes in the ER when Anspaugh makes an unpopular decision. Abby faces up to some old demons, while Kovac receives bad news from Croatia.
In the 300th episode, Luka and Abby prepare to travel to Croatia after Luka's father passes away, and Luka confronts Abby about their relationship problems. Meanwhile, Julia decides to bless the ER.
After being passed over for ER Chief, Pratt makes plans to leave County for a hospital that will appreciate his talents. Meanwhile, Sam meets a woman with a terrible secret.
A fire causes two foster kids and a firefighter to arrive in ER. While treating the children, Abby suspects one of them is suffering from a degenerative eye disorder.
The orthopedic doctors play the trauma doctors in an ice hockey game. Meanwhile, Bettina wants to take her relationship with Pratt to the next level, but Pratt remains hesitant.
Pratt falls out with a new doctor over how the interns should be instructed, and Gates treats a young woman who suffers from serious heart problems
Neela, worn out after her final ortho shift, has to stay on duty when a scheduling mistake has her surgical trauma shift starting immediately
Neela is upset after she finds out the aorta surgery on Sheryl Hawkins has caused an infection. While treating a severely beaten Korean teen, Abby discovers an even more serious condition.
Pratt decides to fight for Bettina, Neela discovers that a young couple are concealing a dark secret, and Abby fears that her relationship with Kovac is over
Morris meets with the hospital psychologist for a debriefing after his run-in with the jewellery thieves. Neela is frustrated when Sheryl Hawkins must go in for another surgery to fix the infection.
Gates worries his relationship with Sam is not as serious as he thought, and a mysterious drunk patient (Steve Buscemi) threatens the safety of everyone at County General