Lives hang in the balance as the members of Station 19 continue to fight a raging inferno inside a skyscraper; Pruitt's health is in grave danger at Grey Sloan; a seasoned firefighter with a mysterious past arrives.

It's a life-or-death situation when a young boy falls into water pipes beneath the city; with the clock ticking, the firefighters jump into action to save his life.

Station 19 receives a call from concerned neighbors about a resident in their apartment building; Ryan takes an unlikely member of the team on a ride-along.

Sullivan assigns each member of the crew a specialty skill to learn, and Ryan is caught off guard when he comes face-to-face with someone from his past. Meanwhile, Sullivan, Andy and Maya handle a structure fire in a derelict building.

Captain Sullivan continues his efforts to bring together the fire and police departments by hosting a training seminar. Meanwhile, Ben and Miranda have an honest conversation about their marriage.

Just when Ryan agrees to talk to it out with his dad, he makes an unexpected visit. Meanwhile, in an effort to connect with his crew, Sullivan looks to an unlikely source for some bonding tips.

As the team gathers for a Friendsgiving celebration at Dean's, a violent windstorm touches down in Seattle. The crew must put the festivities on hold and report for duty, leaving some of members in a life-threatening situation.

In the aftermath of the windstorm, Andy and Sullivan's fates remain unknown while trapped in an overturned car. Meanwhile, the team confronts Jack about his well-being, and the firefighters race against time to find their teammates.

Andy, Maya and Dean respond to a call and find an injured woman who has amnesia. Captain Sullivan takes Ben and Jack on a house call that becomes a close call for the patient they're treating. Ryan may not have seen the last of his father.

Jack and Maya are called to treat people in a subway train and discover a threat, and Travis, Ben and Dean get pressured into inviting Sullivan to help repaint walls in Travis' house and come to a surprising conclusion about Sullivan.

While struggling to help victims of a crash on a desolate road, Vic finds the courage to confront a difficult situation; Ben prepares to go out for Medic One; Pruitt spends time with a special someone.

A blackout in Seattle creates dangerous situations throughout the city and the members of Station 19 head out on calls, including locating a missing girl and helping a man on life support where every second counts.

Station 19 gets called to a structure fire. Ripley and Vic consider a shocking option to save their relationship, while Andy gets some surprising news about some of her fellow crew members. Pruitt takes on a new position.

Following a deadly blaze inside a coffee beanery, the members of Station 19 find themselves on high alert as one of their team lands at Grey Sloan, leaving the future uncertain in the face of a life-threatening situation.

The crew gathers to face the outcome of a life-threatening situation, and Andy and Ben respond to a man impaled by a chandelier, Station 19 is called upon to organize shipments of supplies and assist with wildfires in Los Angeles.

The team packs its gear and heads to Los Angeles to help battle a deadly wildfire that is raging out of control, and Andy and Sullivan continue to explore their attraction to each other.