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 re-energized as he takes teaching to a new level at the hospital; Winston treats a patient suffering from kidney failure.

Seattle's favorite redhead returns and graces the Grey Sloan halls with her experience and expertise as she attempts to help Richard teach the newest crop of residents.

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

The Grey Sloan doctors immediately acts after an explosion rocks Seattle. Owen experiences PTSD when hearing the news of explosion, while his sister Megan enlists help from Winston and Hayes.

It's Thanksgiving, and Meredith has travel problems due to the weather; 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 faces the Morbidity and Mortality conference; Hayes says his goodbyes without revealing his real reason for leaving; Hunt's and Farouk's conditions each begin to improve after their surgeries; Jo acknowledges her feelings for Link.

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. Richard tries to get through to Levi.

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 pushes Teddy and Owen to talk out their issues; A pet python is the show's main squeeze; Grey is offered a promotion and more funding by Dr. Hamilton.

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, and Levi is forced to face reality when his mother is injured.

Bailey faces an unhappy Catherine who is facing audits for several of her Foundation hospitals. Meanwhile, Addison is back at Grey Sloan; tensions rise between Meredith and Richard, and Owen returns to work.

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

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

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

The blood shortage at Grey Sloan Memorial continues. Meanwhile, Meredith makes a risky decision regarding a patient, and Owen's actions to help his fellow veterans come to light.