Thanks to a Department of Defense initiative that places doctors in hospitals for the purpose of training local staff in cutting-edge practices, Col. Ethan Willis arrives to join the team.
After a young talented soccer player suffers a life-changing injury, Willis must help him make an important decision.
Willis disobeys Campbell's instructions and assists Mario and Heather in a daring operation on a maintenance worker trapped under a boiler that blew up.
A fire breaks out at a haunted theater on Halloween night, and Willis, Noa, and Elliott race to the location of the incident.
The whole emergency room is in danger when a group of kids with measles returning from a camping trip arrive at the hospital.
While Willis and Campbell debate about a dying woman who wants to die according to her own terms, Malaya has tell a college student that she has been raped.
Following an explosion, Willis and Campbell are dispatched to a Russian submarine in American waters to help a critically injured sailor.
The medical professionals care for members of a cult who unintentionally survived a group suicide attempt. Mario chooses to bond with the partner of his deceased father.
Willis, Leanne, and Jesse must carry out a dangerous procedure on a police officer who shows up at the emergency room with an explosive bullet lodged in her leg.
When Campbell's 13-year-old daughter comes to the hospital following a seizure, doctors have to tend to her.
Angels Memorial is left without access to electricity or backup generators due to a power failure in the entire city.
Leanne use the hospital helicopter to bring a family back together for the last time, despite Campbell's instructions.
While getting used to his new role as the hospital chaplain, Guthrie thinks about having an experimental procedure to cure his Parkinson's disease.
Mario goes with Willis to a building site in order to help two boys who are stuck in a crane hundreds of feet above the ground.
A virus breaks out, putting the lives of Angels Memorial's physicians and patients in danger.
In an effort to discover a cure for the virus, the physicians at Angels Memorial collaborate with the Center for Disease Control and Prevention.