The new Seattle fire chief is introduced to Station 19 and leaves the crew skeptical after his visit. Later, the firefighters are called to a department store fire caused by exploding fireworks, which triggers painful memories from Ben’s past and inspires him to pursue a new endeavor. Maya advocates for herself and her career, while Jack becomes more intertwined with an acquaintance; and Andy and Ryan have a heart-to-heart.

While Pruitt grieves a monumental loss, Andy refuses to do the same and, instead, throws herself into work. Meanwhile, the crew responds to a widespread carbon monoxide leak, and Sullivan makes a controversial choice for captain.

Ben and Jack mollify a group of homeless foster and biological siblings so they can help save a life, triggering memories from Jack’s past. Meanwhile, Maya pushes the team too hard and struggles to bring them together; and Pruitt threatens to take drastic action when refused a request.

In an effort to increase morale, Maya takes the crew on a team-building camping trip that doesn’t exactly go according to plan. Their bond is put to the test as they work to save first-time campers after a gruesome bear attack. Meanwhile, Pruitt takes steps to repair his relationship with Andy, and Sullivan goes to extreme lengths to find relief from the pain in his leg.

The Station 19 crew responds to a drunk driver scene. Meanwhile, Dean receives advice from Pruitt on a difficult situation, and Sullivan seeks help from Dr. Amelia Shepherd.

After some tense and traumatic experiences, the firefighters get a visit from a psychologist .

The Station 19 crew jumps into action as a violent tornado rips through Seattle. Amidst the chaos, the team makes a shocking discovery buried under a tree, and Travis' first responder instincts kick into high gear at a political event.

Travis discusses his position in the mayoral race as he is determined to kick Dixon out, and Maya admits to blackmail. Meanwhile, the team is called to a fire at a run-down apartment complex that reveals an unsettling cause.

The Station 19 crew responds to the scene of a car accident where two teenagers are trapped inside of an electric car. The scene grows increasingly tense when the teen’s father shows up furious at his son for taking his beloved car without permission. Ben and Maya find themselves caught in the middle of a domestic dispute involving a couple that they detest

Maya and Theo answer a call at a Halloween carnival; but when fire hits the corn maze, the dangers quickly escalate and Maya risks her own life to prove her worth to her increasingly hostile captain. Meanwhile, Station 19 hosts the neighborhood kids for trick-or-treating; a prank war breaks out in the house, and Jack is haunted by a ghost from his past.