The Best Episodes Written By Michael Seitzman

Mario confronts Angus about his Adderall abuse and Christa is surprised to learn how romantically involved Neal and Grace were before she left for Haiti. Also, Dr. Mark Taylor returns to help Leanne find the money in their budget to keep Jesse and the nurses from walking out.

Riley and Gabriel are shocked when the identities of sleeper agents embedded in the U.S. government are revealed.

The doctors must race to save a girl caught in the crossfire of a shoot-out; Willis shifts his focus to field medicine, choosing to work primarily on an ambulance with his new partner, paramedic Rox; Leanne begins her journey to adopt Ariel.

Gabriel and Riley must rescue the kidnapped member of CyberCom who invented the chip implanted in Gabriel's brain before the top-secret technology falls into the wrong hands. Meanwhile, Gabriel takes advantage of his chip to search for his wife who disappeared years ago.

Gabriel and the Cybercom team head to Texas to help contain an outbreak of a deadly, rapidly spreading virus, but when Gabriel cyber-renders ground zero of the outbreak to isolate who Patient Zero might be, he and the team are shocked to see that the suspect is a criminal believed to have been executed a week earlier.

Gabriel and Riley must determine who is responsible for framing Gabriel when he is suspected of murder; Tetazoo leads a manhunt for Riley and Gabriel.

The new residents are introduced to the ER. A new doctor from the army who knows many advanced procedures is flown to a shark attack on the beach with Mike Leighton and Leighton falls 20 feet from the helicopter. Dr. Guthrie Jr. is promoted to the director of the ER in addition to the OR.

Ryan and Alex recruit Owen and Harry to help rescue their friend and defeat The Widow. To help the cause, Owen brings in former agent Jocelyn Turner, who has her own dark past with The Widow.

The team is in Ireland, and when they finally come face-to-face with Conor Devlin, not everyone comes out alive. And Alex makes a life-changing decision about her future.