The crew at Station 19 meet the new Seattle fire chief, but not everyone is feeling welcoming. Ben deals with painful memories from his past.
Pruitt and Andy handle the grief of a devastating loss in differing ways. The crew responds to a widespread carbon monoxide leak.
Maya and Theo answer a call at a Halloween carnival; Station 19 hosts the neighbourhood kids for trick-or-treating; a prank war breaks out in the house; Jack is haunted by a ghost from his past.
A psychologist visits the firefighters to help them work through their traumas.
Maya's team-building trip in the woods doesn't go to plan as the crew must tackle a bear attack, while Pruitt tries to fix things with Andy.