The doctors treat two young girls who have a powerful story; Meredith adjusts to her new roommates; Bailey fights for the chief of surgery position; Jackson readies himself for April's return.
Bailey takes on her first day as chief; April's marriage is in trouble and she struggles to face her problems; Meredith juggles her responsibilities; Amelia tries to define her relationship with Owen.
When Maggie gets an invitation to her ex-boyfriend's wedding, she starts to reevaluate her choices; Bailey's loyalty falls into question; Jo opens up to Stephanie about a secret; Alex must make a decision that will affect the lives of two babies.
Owen suggests the interns learn about breaking bad news to patients' families; Arizona's elderly patient tells her she will find love again; the sisters forget about the dinner party they're hosting.
Maggie ditches cooking duties at her sister's dinner party to rush to the hospital; April tries to avoid Jackson; Arizona waits to learn more about Callie's girlfriend.
A new resident transfers to Grey Sloan Memorial; Richard is uncertain how to advance his relationship with Maggie; a young boy from the Middle East needs treatment.
Tension rises as the doctors help a long-time patient; Bailey urges Ben to ask their roommate to leave; Arizona wants to start dating again.
As gossip continues to spread, a wildfire sends many firefighters to the hospital; Maggie tries to stay professional with Andrew at work; Alex's priorities are questioned.
A patient brutally attacks Meredith; after Penny learns what happened, the doctors rush to save Meredith.
As everyone deals with Meredith's trauma, Maggie and Callie perform a risky, experimental surgery on a teenager; Nathan and Owen remain at odds; Maggie and Andrew's relationship progresses.
Flashbacks reveal the evolution of April and Jackson's relationship, beginning with their initial meeting, and the years-long progress of one of Jackson's patients.
A patient from Meredith's first surgery as an intern is re-admitted to the hospital with an aneurysm; Maggie thinks Richard knows about her relationship with Andrew; Arizona considers dating again.
Meredith, Bailey, Jackson, Callie and Jo travel to a military hospital to perform a risky surgery; Andrew doesn't want his relationship with Maggie to be a secret anymore; Ben acts on impulse; cheerleaders cause chaos in the emergency room.
Turmoil ensues when Richard changes the staff pairings; Arizona takes a risk helping a woman who is pregnant with quadruplets; April must make a tough decision.
Jackson finds out about April's pregnancy; Alex and the doctors tackle a triple organ transplant surgery; Meredith thinks about getting back into dating; Andrew requests no special treatment.
Meredith regrets taking a step forward with Will; Maggie feels disconnected; Amelia considers her relationship with Owen; Catherine's arrival shakes things up with April and Jackson.
Meredith, Owen and Nathan go to pick up a heart for a transplant; a musician who has MS is admitted with a hand tremor; the residents apply for a grant; Catherine keeps butting into Jackson and April's business.
As chief, Miranda is faced with the repercussions when Ben operates on a pregnant mother even though he does not have the proper surgical equipment.
Miranda forms an advisory committee to recommend disciplinary action against Ben; April and Jackson try to get along for their baby's sake; Arizona's decision could affect her relationship with Callie.
The doctors work to save a young gunshot victim; Callie tries to make a decision about Sophia's future without consulting Arizona.
Stephanie has difficulty with boundaries; Callie and Arizona turn to their friends for support during a tough time.
Alex and April assist a pregnant teen going through a medical crisis; Callie and Arizona butt heads over what is best for Sofia.
Amelia and Owen deepen their relationship; Alex has a clearer view of his future with Jo; Callie and Arizona struggle with their custody arrangement.