Setting the Tone: An ER Retrospective

This week: As the rumor mill heats up, Abby reveals to the rest of the ER where she's been the last few weeks, Julia wants to get more serious with Gates, Pratt steps up to lead the team as Skye is out sick, a fire in an apartment building sends multiple foster children to the hospital, Neela has an unconventional first day in orthopedics, Morris has food poisoning, and a disfigured man saves his neighbour after she's been badly beaten.

This week: A familiar face is brought back after her son is injured, Neela's very flirty cousin is stateside for a surprise visit as she gets a new career opportunity, Pratt's interview for the ER chief job leaves his future at County in doubt, Sam is training for a triathlon, and an injured soldier reveals a traumatic event from her time in Iraq.

On this week's 300th episode: Morris makes a bet that the ER will take in 300 patients before the next shift comes in, Julia leads the staff in a blessing ceremony, Sam's transport training goes sideways after her ambulance is in an accident, Neela has to swab a camel's mouth after it bites Dubenko, Pratt helps a family after a wife and son are in a bad car accident, and Abby's finally reveals her drinking to Luka as they prepare to go to Croatia.

This week: Much to her surprise, Skye is named interim chief of the ER, Pratt ponders where his career is headed at County, Luka confronts Abby about what's been wrong with her lately, Gates helps a kid trying to be tough for his dad, Neela rocks her first solo surgery, Morris wants to pump Sam up, and a man's extremely racist son destroys an immigrant woman's family after a misunderstanding of how a factory accident happened.

This week: David Zabel throws up on his computer trying to fix his mistakes from last week