As Ben readies the new Physician Response Team truck for the field, his suspicions about Sullivan and the missing Fentanyl continue to grow. Meanwhile, Jack and Rigo try to look past their differences when they are forced to work together and fight a mysterious gas station fire; Dean and JJ try to work through their differing parenting styles; and Travis meets someone new.

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.

When an Army veteran threatens to blow up a pawn shop, Sullivan reflects on his time as a Marine to deescalate the situation. Meanwhile, Vic and Dean try to reason with a man battling Alzheimer’s disease; and Pruitt takes a stand to honor fallen firefighters.

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

While at a lunch seeking Pruitt’s blessing for their relationship, Andy and Sullivan jump into action when ICE attempts to raid the restaurant. Meanwhile, Travis gets roped into an awkward lunch with Chief Dixon, Emmett and Emmett’s girlfriend; and Ben invites Grey-Sloan Memorial surgeons Owen Hunt, Teddy Altman and Jackson Avery to get a sneak peek of the new PRT vehicle.

The Station 19 crew battles a storage facility fire with growing complications, and Dr. Jackson Avery pops over from Grey Sloan and ends up collaborating with old pal Ben Warren.

Vic rallies the crew to pose for a calendar photo shoot that will support a good cause. Meanwhile, Emmett comes clean to Ben and Sullivan, and shows Andy a softer side.

Andy returns to work while she and Jack fight to save people trapped in a collapsing bowling alley. Meanwhile, Ben confronts Sullivan about his drug problem; and Maya’s mother, Katherine, pays Maya a visit.

Ben, Jackson and Emmett are put in a precarious and dangerous position with a potential victim. Andy’s search for more background on her family opens her eyes, and Vic and Travis are caught in the middle of a corruption scheme.

Andy becomes painfully suspicious of the circumstances surrounding her mother’s death and goes to her aunt looking for answers. Meanwhile, the members of the crew work to evacuate a doctor from Pac-North hospital and find themselves in a life-threatening situation; and Sullivan undergoes surgery for his chronic leg pain.

The future of Sullivan's career hangs in the balance as his disciplinary hearing gets underway, and Ben, Dr. Richard Webber, Emmett Dixon and former Fire Chief Dixon are called to testify. Meanwhile, the crew investigates an electrical fire at a neglected apartment building that serves as the home and performance space for some of Seattle's most prominent drag queens.

The team responds to a difficult domestic dispute involving a pregnant woman. Meanwhile, Travis struggles to deal with a family crisis, and Maya and Carina’s relationship continues to grow.

The Station 19 crew is called to a cult gathering where they find their leader dancing on the roof and claiming he can fly. Travis gets a surprise visit from his father. Dean makes a difficult decision that could affect his career trajectory.

Vic’s love life is complicated again as she learns of a shocking secret. Meanwhile, Andy grows frustrated at Sullivan for undermining her authority, and Maya struggles to keep her jealousy at bay when one of Carina’s old flames comes to visit.

Vic and Travis’ friendship is put to the test as they respond to calls to help two best friends in need. Meanwhile, Jack realizes he has a greater impact on Marcus than he realizes, and new details about Travis’ late husband’s tragic death are revealed.

Andy, Sullivan, Dean and Ben are faced with a tough choice while trying to save a couple trapped in their car. Meanwhile, Dean second guesses his legal fight against the Seattle Police Department; Travis’ dad fears he will be outed when his “golfing friend” is exposed to COVID-19; and Carina’s immigration status is called into question.

Maya, Jack, Vic, Travis and Sullivan respond to a burn call at an ice rink. Meanwhile, a pregnant woman and her husband seek out the station for help; and Maya and Carina have a difficult conversation.

Maya addresses some unresolved family issues, and the crew takes matters into their own hands when faced with a life-or-death moment on scene. Meanwhile, Andy and Sullivan’s marriage is put to the test.

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)

Station 19 and Station 23 each attempt to celebrate Thanksgiving following the fallout from the neighborhood explosion. The firefighters come together to cook, toast to loved ones they have lost, and celebrate the families they have become.

It’s the most wonderful time of the year and the firefighters have their hands full responding to a number of crises throughout Seattle. Putting aside their differences and personal drama, they come together to try and achieve a Christmas miracle.

The Station 19 crew offers aid to a man who sets himself on fire. Theo proves his devotion to Vic; Sullivan seeks advice from Dr. Webber; and Travis comes to a realization about his love life.

The Dean Miller Memorial Clinic has its opening day. Meanwhile, Sullivan gives Beckett an ultimatum, and the crew responds to a skydiving incident

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 steps into the station’s captaincy as Jack's life hangs in the balance. The team is called to a hostage situation. Natasha fights for her career, and Maya and Carina make a choice.

Ben and Theo respond to a challenging Crisis One call, and Jack struggles adjusting to his new reality. Maya and Carina treat a nanny with a surprising diagnosis. Travis finds a surprise at Dixon's wake, and Vic joins Beckett at a family funeral.