Owen suggests the interns learn a vital lesson on how to break bad news to patients’ families, and Arizona’s 90-year-old patient reassures her that she’s destined to find love again. Meanwhile, the sisters completely forget about the dinner party they’re hosting for everyone.

Meredith takes a step forward with Will but quickly regrets it; Maggie senses a disconnection with Andrew; and Amelia reevaluates her relationship with Owen. Meanwhile, Catherine comes into town and really shakes things up with April and Jackson.

After a missing child forces the hospital into lockdown, Ben decides to operate on a pregnant mother without the proper surgical equipment. Miranda, as Chief, is faced with the repercussions of the event and whether or not Ben's impulsive actions were justified.

Believing he is going to jail tomorrow, Alex makes a big decision about his future. While the hospital is overrun with victims of a building collapse, Richard demands answers from Bailey about Eliza’s presence at Grey Sloan.

Alex returns to the hospital and discovers a lot has changed since he left. Meanwhile, Jo has to make a difficult decision on a case, and Arizona tries to distance herself from Eliza.

When Maggie takes on a big case, many of the doctors are worried she’s not the right one for the job while Stephanie makes a mistake treating one of Grey Sloan’s own.

Bailey and April work to fix things between Richard and Catherine; Eliza continues to pursue Arizona; one of Alex's previous patients returns to Grey Sloan.

The doctors of Grey Sloan encounter a difficult case involving a dangerous patient. Meanwhile, Owen receives life-changing news that pushes Amelia to step up to support him, and Alex attends a medical conference after making a shocking discovery.

Harper Avery arrives at Grey Sloan, putting Bailey on edge. A familiar face from Meredith’s past returns as a patient, and Amelia tries to manage a secret.

Meredith works on a patient who happens to specialize in matchmaking, and a seemingly drunk patient pushes Richard's buttons and gives him a medical mystery to solve. Meanwhile, Maggie tries to reach Teddy after bearing the burden of her secret becomes overwhelming as she struggles with issues in her own personal life.

After Meredith inadvertently stirs up negative press for Grey Sloan, she tries to make things right with her former colleagues, jeopardizing her community service hours. Station 19’s Ben and Vic bring a young woman into the hospital, and Jackson stands up to Koracick when he goes too far with a patient’s family. Meanwhile, Bailey receives unexpected news; and Owen finds himself at Pac-Gen North, which Alex sees as a recruiting opportunity.

Meredith faces the medical board as her future as a doctor remains uncertain, and she’s forced to reckon with her past in some challenging ways. Meanwhile, the interns are put to the test as they are each vying to be the most successful on their respective cases in the absence of some of the attendings.

Jo becomes a safe haven volunteer and gets a call that a baby has been dropped off at Station 19. Meanwhile, Meredith moves forward with her life after facing the medical board. Jackson takes a big step in his budding romance with Vic, while Bailey and Amelia swap pregnancy updates.

Following the car crash at Joe’s Bar and subsequent rescue efforts led by the Station 19 firefighters, Grey Sloan doctors work through the night to save the lives of their colleagues. Meanwhile, Amelia worries about sharing her pregnancy revelation with Link. Owen and Teddy take a big step, and Bailey deals with grief over her recent loss.

The crossover starts on Station 19 S03E01 I Know This Bar (I).

Richard finds out Maggie quit Grey Sloan and is concerned about how she’s handling the death of her patient who was her estranged cousin. Bailey returns to work after taking some personal time off, although Koracick doesn’t make her first day as easy as she’d like. Meanwhile, Meredith thinks she might miss DeLuca, and Amelia has an update for Link on her pregnancy.

DeLuca can’t figure out what’s going on with his incurable patient Suzanne and he turns to a diagnostics genius, Dr. Riley from UCSF, for help. Bailey checks in on Joey, a foster kid that Ben brought into Grey Sloan. Meanwhile, Amelia is getting the results of her paternity test and Jo confronts her about how she is treating Link.

Meredith heads up a pro bono surgery day, but the overwhelming patient response causes her to struggle to keep things in order. DeLuca treats a teenage patient whom he suspects is in danger and desperately tries to get Bailey to support his theory.

Link tries to convince Amelia to take it easy during the final stage of her pregnancy. Hayes asks Meredith a surprising question, and Owen makes a shocking discovery.