This week: Jerry returns and gets his old job back, Morris gets saddled with a storage locker of stuff from his dead father, Banfield advocates for a cancer patient to get a palliative surgery, Alex is on the mend, but Sam can't forgive Gates for what happened, Daria and Sanchez get super high, and Neela cares for a pregnant woman who is wanted by ICE.

This week: Morris and Banfield have an evening of drunken misadventures as they get snowed in at an Omaha airport, The interns all kinda hate Neela, Chaz babysits and tries to explain death to what's sure to be this season's shittiest kid, and as a blizzard rages in Chicago, Alex and Sarah get into a car accident that leaves Alex fighting for his life as Sam watches on.   

Content warning: storyline about a pedophile and Brenner's trauma from childhood sexual abuse.   This week: Tension is in the air after an alleged pedophile is brought with after a house fire, Brenner has himself a little crashout, Gates finally explains why he cares so much about finding Max, Andrew bounces back with a great save, Morris is caught in the middle of everyone's issues, and Dubenko reminds Neela what she was like when she was an intern.   

This week: Past and present collide as Banfield recalls how her son died at County 7 years ago as she, Morris, and Tracy attempt to save a little girl who nearly drowned after falling into Lake Michigan.

This week: Morris puts far, far too much responsibility on Chaz during his 1st-year ER rotation, Gates connects with a homeless army veteran, Daria is still acting weird, Neela and Banfield have differences of opinions on teaching methods, Sam and Alex make a big life decision, and Chadwick Boseman guest stars as a boxer who may have taken one too many shots to the head.

This week: It's the show's last Halloween episode as Gates is a real jerk to Sam, Banfield remains her usual curmudgeonly self, a bird gets loose in the ER, Brenner takes issue with a mom's behavior after her son was in a fight at school and stabbed another student with a fork, Daria is acting very weird and flirty, Frank dresses up as Julius Cesar, Morris and Tracy make a great save, and Neela is thrilled when Ray makes a surprise visit to County General.   

This week: Gates struggles with parenting after Sarah makes a bold choice on a dare, the interns get paired off with other doctors for the day, Morris is still down on love, Banfield does some digging to find out about a weird family situation that's resulted in multiple injuries, and Brenner does what he can to help a son reconnect with his father after his mom is in a car accident.  

This week: The story of Abigail Lockheart, MD at Country General comes to a close as she fights with Banfield, saves a basketball coach who has been shot, appreciates the good work of Neela and a returning Dubenko, fights for Sam's job, reassures Morris that he is indeed a good doctor, and manages to talk a young man out of killing himself. 

This week: The writers decide to throw FIVE new characters at us (including four new interns), Morris has already had enough of the new ER chief micromanaging everyone, Dubenko's departure leaves Crenshaw massively overworked, Sam contributes to a guy killing himself, and a small act of bioterrorism forces the ER to evacuate while Gates and three of the interns are stuck in the middle of it.   

This week: The ambulance explosion last episode leaves Pratt and Bardelli fighting for their lives, a young girl is in trouble after being trapped in a burning car, and older woman has severe injuries after a fall, Abby somehow only has minor injuries from being near the explosion, and ER composer Martin Davich turns in one of the most impactful soundtracks in the show's history.