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4
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1
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45
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1st Episode
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Ava pulls out all the stops to ensure that Connor stays in...Read more Chicago. Goodwin butts heads with the hospital's new COO. Dr. Charles deals with the aftermath of his actions with Dr. Reese's father.
193
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4
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2
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45
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2nd Episode
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As the ED receives an influx of patients after an apartment...Read more fire, Will faces a personal dilemma when his own father is rushed to the hospital. Connor faces pressure when he becomes the only thing standing between a firefighter and losing her career.
249
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4
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3
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45
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3rd Episode
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Ethan is forced to choose between obeying the law and saving...Read more his patient's life. Connor recruits Maggie to assist him in the hybrid OR.
135
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4
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4
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45
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4th Episode
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Will gets embroiled in a CPD investigation after getting...Read more involved with a shady wedding hall owner. Natalie deals with an undocumented patient.
142
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4
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5
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45
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5th Episode
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Will hides the truth about his involvement in an undercover...Read more operation from Natalie. Ethan is shocked when he finds out damaging information about Emily's boyfriend.
164
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4
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6
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45
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6th Episode
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Will and Natalie team up to help a patient whom they suspect...Read more is being abused. Connor and Lanik clash over the latter's treatment of med students. Ethan and Dr. Charles stumble upon a secret about one of their patients.
218
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4
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7
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45
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7th Episode
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A chemical spill causes tensions to rise in the ED as one of...Read more their own lands in peril. Connor discovers the truth about his father's involvement with the hybrid OR.
164
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4
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8
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45
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8th Episode
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Will's involvement with the FBI puts a strain on his...Read more relationship with Natalie as he continues to lie to her. Ethan clashes with Dr. Charles on how to handle a mentally ill patient.
181
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4
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9
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45
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9th Episode
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Will and Natalie's wedding day takes an unexpected turn when...Read more Will is kidnapped and exposed as an informant for the FBI.
119
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4
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10
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45
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10th Episode
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Tensions rise between Connor and his father after Ava tells...Read more the former that his father is spreading lies about her. A drive-by shooting leaves April injured and pushes Ethan to the brink as he is forced to treat the shooter.
224
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4
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11
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45
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11th Episode
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The effects of Will's ordeal lead him to take drastic...Read more actions with a patient. A case hits too close to home for Ethan as he deals with a homeless veteran.
154
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4
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12
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45
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12th Episode
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When Elsa takes the outcome of a case hard, April steps in...Read more to console her. Will rushes to Natalie's side when her chopper crash lands.
134
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4
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13
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45
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13th Episode
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Trust issues boil over between Will and Natalie, especially...Read more after he hides the theft of his gun from her. A risky operation on an HIV patient takes a turn when Ava faces the possibility of infection.
199
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4
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14
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45
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14th Episode
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When a familiar face returns to the ED, a guilt-stricken...Read more Maggie takes drastic actions to help. Will continues to spiral as someone connected to him lands in the hospital with a gunshot wound.
191
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4
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15
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45
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15th Episode
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Natalie and Maggie jump in to perform triage after a truck...Read more crashes through a festival. Dr. Charles recieves unexpected news about his family as Connor deals with Robin's return.
177
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4
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16
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45
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16th Episode
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The conflict between Ava and Connor escalates after she...Read more challenges his refusal to operate on Robin's mother. Ethan and April deal with a heartbreaking case in which a brother is being used as a constant donor to his cancer-stricken brother.
240
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4
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17
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45
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17th Episode
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The ED is shaken when a car crashes through the doors,...Read more leaving the life of one of their own on the line, and forcing Ethan to make a difficult choice.
150
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4
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18
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45
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18th Episode
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Connor deals with a dangerous situation involving Robin....Read more Natalie and Ethan clash over an issue that involves doctor-patient confidentiality and parental consent.
161
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4
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19
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45
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19th Episode
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As Connor receives troubling news about his father, the two...Read more are forced to reevaluate their relationship. Chaos ensues at the hospital when a gunman holds everyone hostage to prevent his girlfriend from giving their baby away.
225
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4
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20
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45
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20th Episode
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Ethan is forced to put his feelings about Emily's boyfriend...Read more aside when he lands in the ED as a patient. Connor confronts Ava about his suspicions. Natalie and Dr. Charles are at odds over the proper treatment of a cultist who is harming herself.
245
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4
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21
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45
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21st Episode
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Will faces a difficult decision when he discovers a...Read more disturbing fact about Maggie's sister. Ethan and April are left to deal with Emily's sudden decision to walk out on her baby. Connor gets difficult news.
205
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4
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22
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45
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22nd Episode
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Connor grows suspicious of the circumstances of his father's...Read more death. Maggie recieves some bad news. Agent Lee shares some news with Natalie that cause her to reevaluate her relationship with Will.
195
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