The Grey Sloan doctors treat a patient who encountered illegal fireworks; Bailey has her sights set on hiring new doctors, but she's having trouble finding viable options; Owen and Teddy attempt to take the next step in their engagement.

Meredith seeks advice from Amelia; Richard is reenergized as he takes teaching to a new level at the hospital; Winston treats a patient suffering from kidney failure.

Dr. Addison Forbes Montgomery returns and graces the Grey Sloan halls with her experience and expertise as she attempts to help Richard teach the newest crop of residents; Meredith has a decision to make; Link confides in Teddy.

Richard recruits Meredith and Bailey to help him launch a new program; Addison's patient has complications from a procedure; Jo helps a woman who goes into premature labor.

The doctors spring into action after an explosion rocks Seattle, with the incoming trauma hitting close to home; in Minnesota, Meredith and Amelia meet up with a familiar face who assists in their study.

It's Thanksgiving, and while Meredith faces travel complications due to the weather, Nick steps in to help in more ways than one; Richard and Bailey seek out emergency surgeries; Amelia and Link reconnect.

Dr. Hamilton takes his frustrations out on Meredith, so Nick gives her a chance to blow off steam by scrubbing in on a surgery; Link and Jo take their kids to a fairy-tale theater performance that goes wrong.

The doctors celebrate the holidays; Hamilton and Meredith prepare for a milestone on their project; Link wants to spend the holiday with Amelia and Scout as a family; Schmitt is faced with a difficult decision during surgery.

The Grey Sloan Memorial doctors grapple with the aftermath of the car crash that involved some of their own; Meredith works to save Dr. Hamilton's life; Levi is impacted from his latest loss.

Schmitt must face the Morbidity and Mortality conference; Meredith convinces Nick to scrub in on a surgery in Seattle; Jo faces her feelings.

Meredith, Amelia and the team prepare for Dr. Hamilton's long-awaited groundbreaking surgery; Bailey receives an unexpected offer; Owen's impatience makes him a difficult physical therapy patient, forcing Link to intervene.

Nick whisks Meredith away to his Minnesota cabin for a romantic weekend, leaving Winston and Maggie to care for Meredith's children. Meanwhile, Amelia and Kai grow closer.

Richard ponders his surgical abilities; Jo is charmed by her patient's brother; Megan makes sure Teddy and Owen talk out their differences; a pet python causes an uproar.

Tensions at Grey Sloan Memorial rise as the effects of the physician shortage begin to show; Meredith struggles to step away from work as she spends a sick day at home with Zola; the hospital receives an unexpected visitor.

Bailey is on edge when an accreditation council reviews the residency program; Nick returns to Seattle to perform a first-of-its-kind operation with Meredith.

Catherine faces audits for several of her foundation hospitals; Addison returns to Grey Sloan; tensions rise between Meredith and Richard; Owen goes back to work.

A former patient of Link's, Simon, is in the emergency room with his pregnant wife; Bailey receives an offer from Nick.

A dinner party is thrown at the sister house in Nick's honor; Grey Sloan Memorial receives a victim of a brutal hate crime.

Due to a blood shortage, Grey Sloan Memorial sets up a voluntary donation center; Nick asks Meredith for help with his patient; Winston is hung up on his relationship with his brother.

The blood shortage continues; Meredith makes a risky decision regarding a patient; Owen's actions to help his fellow veterans come to light.