Col. Ethan Willis has joined the team thanks to a Pentagon initiative that places medical professionals in hospitals for the purpose of training local staff in cutting-edge practices.
After a potential soccer player suffers a life-changing injury, Willis must help him make a decision.
Willis disobeys Campbell's orders and assists Mario and Heather in a daring surgery on a maintenance worker trapped under an exploding boiler.
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 return from a camping vacation.
While Willis and Campbell debate about a dying woman who wants to die on her own terms, Malaya must tell a college student that she has been raped.
A Russian submarine explodes in American waters, and Willis and Campbell are dispatched there to treat a critically injured sailor.
The medical professionals care for members of the cult who unintentionally survived a mass suicide attempt. Mario chooses to get in touch with the lover of his deceased father.
Wills, Leanne, and Jesse must carry out a dangerous procedure on a police officer who shows up at the emergency department with an explosive bullet lodged in her leg.
When Campbell's 13-year-old daughter comes at the hospital following a seizure, doctors have to tend to her.
Angels Memorial is without access to backup generators or electricity due to a citywide power failure.
Leanne use the hospital helicopter to bring a family back together for the last time, despite Campbell's orders.
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 300-foot-high crane.
Angel's Memorial's physicians and patients are in danger due to a virus epidemic.
In an effort to discover a remedy for the viral epidemic, the physicians at Angel's Memorial collaborate with the Center for Disease Control and Prevention.