Series 4 Episode 1
A documentary film crew invades the ER. Weaver tells Carter he must repeat his intern year. Hathaway and Ross continue their secret affair. British trauma specialist Elizabeth Corday joins the staff.
Series 4 Episode 1
Ambush: A documentary film crew invades the ER, seeing more than the medical staff wish to expose
Series 4 Episode 1
Series 4 Episode 2
Something New: A still suffering Greene misdiagnoses his cases. Carter meets his new medical student.
Series 4 Episode 2
Series 4 Episode 3
Friendly Fire: Jerry accidentally starts a fire. Hathaway is jealous when Corday shows interest in Ross.
Series 4 Episode 3
Series 4 Episode 4
When the Bough Breaks: Greene is denied the chance to spend time with his child. Weaver gives Ross an ultimatum.
Series 4 Episode 4
Series 4 Episode 5
Good Touch, Bad Touch: Benton finds it hard to keep up with his workload. Carter questions his career choice.
Series 4 Episode 5
Series 4 Episode 6
Ground Zero: Greene's behaviour spirals out of control, while Weaver attends a cost-cutting symposium
Series 4 Episode 6
Series 4 Episode 7
Fathers and Sons: Ross and Greene travel to California to make the funeral arrangements for Ross's father
Series 4 Episode 7
Series 4 Episode 8
Freak Show: A teen with inverted internal organs needs emergency surgery. Cynthia makes more mistakes.
Series 4 Episode 8
Series 4 Episode 9
Obstruction of Justice: After defending a patient, Carter is arrested for refusing to cooperate with the police
Series 4 Episode 9
Series 4 Episode 10
Do You See What I See?: A blind man comes to believe Benton is a miracle worker with remarkable healing powers
Series 4 Episode 10
Series 4 Episode 11
Think Warm Thoughts: Ross wants to set a wedding date but Hathaway isn't sure. Dr Anspaugh's son is rushed in.
Series 4 Episode 11
Series 4 Episode 12
Sharp Relief: Weaver questions Synergix's management practices. Benton and Corday spend time together.
Series 4 Episode 12
Series 4 Episode 13
Carter's Choice: Carter faces a tough decision as he works to save a rapist's life. Ross feels humiliated.
Series 4 Episode 13
Series 4 Episode 14
Family Practice: When Greene returns to San Diego to help out during a family crisis, Cynthia follows him
Series 4 Episode 14
Series 4 Episode 15
Exodus: A chemical warehouse explosion sends injured workers to the ER, putting everyone in danger
Series 4 Episode 15
Series 4 Episode 16
My Brother's Keeper: Romano gives Corday a poor review. Carter's cousin is rushed in after a heroin overdose.
Series 4 Episode 16
Series 4 Episode 17
A Bloody Mess: A test reveals Scott's cancer has returned. Benton, Corday and Reese have a car accident.
Series 4 Episode 17
Series 4 Episode 18
Gut Reaction: Ross seeks a new post. Benton clashes with Morgenstern. Hathaway's clinic loses funding.
Series 4 Episode 18
Series 4 Episode 19
Shades of Gray: The ER treats victims from the bombing of a family planning clinic. Benton is suspended.
Series 4 Episode 19
Series 4 Episode 20
Of Past Regret and Future Fear: Hathaway comforts a burns victim. Carter reaches an understanding with his grandmother.
Series 4 Episode 20