As Carter prepares to open a new facility for the underprivileged, some old friends/colleagues gather. Rachel Greene, Mark Greene’s daughter, applies for an internship at County.

ER’s 300th episode finds Luka and Abby hurriedly preparing to travel to Croatia after Luka’s father passes away. Luka confronts Abby about the estrangement between them, and she eventually reaches…

After being passed over for Chief of the ER, Pratt is looking for a hospital that will appreciate his talents. A former employee of the ER brings her sick son…

Abby is back from rehab and finds herself the object of scrutiny. She confesses to Pratt that Luka might stay in Croatia longer than planned. Harold seems to have won…

The rainy night brings in diverse patients including a mother involved in a car accident with her baby, a man with a satisfaction facilitator, and a comatose patient who suddenly…

The rainy night brings in diverse patients including a mother involved in a car accident with her baby, a man with a satisfaction facilitator, and a comatose patient who suddenly…

A new attending, Dr. Victor Clemente, comes aboard and quickly makes a stir on the ER. Abby’s breast cancer patient convinces her to take a long awaited test. Luka befriends…

A new attending, Dr. Victor Clemente, comes aboard and quickly makes a stir on the ER. Abby’s breast cancer patient convinces her to take a long awaited test. Luka befriends…

A power outage strikes on an unusually hot day, bringing nursing home patients suffering from hyperthermia to the ER. Abby and Pratt disagree about diagnostic tests for a fussy baby….

Neela and Sam are shocked when they arrive back to the airport with transplant organs only to find that their plane has left them. Dr. Carter gets a surprise visit…

Everyone at the ER is happily surprised to see Luka back from Croatia. Great news awaits Neela. Sarah once again needs rescuing by Tony, and patients are causing problems for…

On Neela’s last day at County, she has doubts as to whether she is making the right decision.

On Neela’s last day at County, she has doubts as to whether she is making the right decision.

Sam and Luka go on the search for her runaway son, Alex. Meanwhile, Pratt and Lewis guide Abby, Neela and Ray, who have become R2’s, on how to teach the…

Sam and Luka go on the search for her runaway son, Alex. Meanwhile, Pratt and Lewis guide Abby, Neela and Ray, who have become R2’s, on how to teach the…

A camera crew interviews the staff at County General for a documentary on emergency medicine. Morris’ cop girlfriend gets injured on the job and is rushed into the ER with…

Morris and Pratt cram for their medical boards when Morretti brings in a new attending physician to help with the load. Sam and Abby work on an attention-hungry patient who…

A camera crew interviews the staff at County General for a documentary on emergency medicine. Morris’ cop girlfriend gets injured on the job and is rushed into the ER with…

Neela and Sam are shocked when they arrive back to the airport with transplant organs only to find that their plane has left them. Dr. Carter gets a surprise visit…

Sam gets frustrated with Gates when he gets obsessed with finding a homeless war hero. Neela is upset at her intern after he gets the entire surgery department into a…

Sam gets frustrated with Gates when he gets obsessed with finding a homeless war hero. Neela is upset at her intern after he gets the entire surgery department into a…

Abby awakens after the ambulance explosion and rushes to check on Pratt; Sam and Gates rush to the scene; Morris and Neela struggle to keep up with Pratt’s injuries.

Everyone in the ER is trying to cope with the loss of their colleague. The staff feels defensive toward the new Chief and her tough disposition. Gates and the new…

Everyone in the ER is trying to cope with the loss of their colleague. The staff feels defensive toward the new Chief and her tough disposition. Gates and the new…

Neela is upset when she finds out Abby’s good news second hand; the new chief, Catherine Banfield, and Abby disagree on how to treat a gunshot wound victim; Abby defends…

Neela is upset when she finds out Abby’s good news second hand; the new chief, Catherine Banfield, and Abby disagree on how to treat a gunshot wound victim; Abby defends…

Deb and Carter compete furiously for procedures after Benton announces their books are due a week earlier than previously announced. Deb commits a nearly deadly error on a patient while…

Susan has her hands full with a pregnant Chloe. Benton goes to dinner with Jeanie. Greene further alienates Swift when he decides to honor a family commitment rather than stay…

Mark and Jennifer struggle to remain together as Mark has moved in with her in Milwaukee. Doug coaches Jake’s little league team. Chloe’s irresponsibility wears Susan down. Carter asks Benton…

Susan is forced into the role of parent when Chloe gives birth and both Chloe and her mother, Cookie, shirk responsibility. Doug is surprised and a bit frightened when Diane…

Carter faces his last day in the hospital with aplomb, harshly grading Benton on an evaluation report. He later rescinds the report after finding out that the surgical sub-I is…

Mark, still upset over the loss of Jodi O’Brien, takes the night off but ends up in the ER anyway, albeit an hour late, when the new chief runs a…

A case of apparent spousal abuse is not what it seems. Deb outshines Carter after he is up all night preparing for a presentation. Peter informs Jackie he’s hired a…

Morganstern invites Mark to join the staff as an attending physician. Mark treats an woman with breast cancer, who begs him to kill her. Deb “wows” Benton with her amazing…

Carol worries about a Russian girl with AIDS who’s brought in and then abandoned by her foster mother. Kayson asks Susan to be his Valentine. Deb accidentally consumes LSD-laced chocolates.

Peter refuses to sleep, despite Hicks’ order, in the middle of a 48-hour shift. His lack of sleep catches up with him when he is supposed to be watching his…

A busy Dr. Greene goes all day in solving his patients’ problems until he encounters the case of a pregnant woman suffering from complications that threaten both her life and…

Hathaway treats a rape victim. Walt brings Benton’s mother to the ER with a sprained ankle. Carter shows his annoyance toward Benton and his stand-offish attitude. Mark calls in sick…

Carter and Benton treat a suicidal transgender woman. Doug feels like a ‘kept man’ in his relationship with Linda Farrell. A patient entrusts Carol with the particulars in an accident….

A severe blizzard leaves the ER utterly devoid of patients, leaving the staff free to goof off. In the middle of their fun, a call comes from dispatch, informing the…