Relationships are challenged at Station 19 following Sullivan’s actions at Maya and Carina’s wedding, putting his marriage with Andy to the test. Dean comes to terms with his feelings for Vic, while Travis rekindles an old flame. The annual Phoenix Festival brings out some reckless behavior in some of Seattle’s citizens, challenging the teams at Station 19 and Grey Sloan Memorial.

The crossover continues on Grey's Anatomy S18E01 Here Comes the Sun (II).

Andy and Sullivan’s relationship continues to be tested. Meanwhile, Emmett joins Dean and Vic on a mental health call, and Maya does some soul searching.

Diane returns to help with Crisis One intervention training for Station 19 and Station 23 firefighters. Meanwhile, Andy and Sullivan continue to be at odds, and Jack helps a young autistic man on a city bus.

When Theo and Vic hit a relationship milestone, Vic is forced to reckon with her feelings about commitment. Andy takes refuge at Dean’s home and helps care for Pruitt, while Dean considers a new potential career opportunity. Meanwhile, an explosion rips apart a neighborhood and changes the lives of our firefighters forever. The crossover continues on Grey's Anatomy S18E05: Bottle Up and Explode! (II)

Vic and Jack lean on one another as they process the loss of Dean while Ben and Bailey try to convince Dean’s parents to allow them to raise Pru. Meanwhile at Station 23, Andy’s role temporarily expands and Sullivan subs in. Carina and Maya explore growing their family.

A new chief starts at Station 19. Meanwhile, the crew responds to a young girl seeking help and a call about an SUV flown over a cliff. The crossover continues on Grey's Anatomy S18E09: No Time to Die (II)

Travis and Theo face danger while responding to an emergency at a haunted house. Ben continues his fight for Baby Pru; Vic opens up to Andy; and Station 19 prepares to welcome patients to the Dean Miller Memorial Clinic.

Through a series of flashbacks, Sullivan and Natasha’s past is revealed. Meanwhile, Ben and Bailey have a discussion with Pru’s grandparents, and the crew responds to a fire at a candy factory.

The crew at Station 23 faces a difficult goodbye. Meanwhile, Andy meets a charming firefighter, and Emmett invites Travis to have dinner with his parents.

Andy deals with the aftermath of a trauma.

The Station 19 crew trade in their turnouts for tuxes and gowns as they attend the Firefighters Ball, but when disaster strikes, they jump into action to save the day.