Owen and Link treat an older woman who wakes up from surgery and can't stop singing; Teddy helps Koracick stay afloat after an estranged loved one from his past comes to the hospital looking for help.

Richard preps to present his PATH pen at the LA Surgical Innovation Conference but becomes distracted by his issues with Catherine; Maggie and Teddy run into people from their past; Hayes relives moments from when he met his late wife.

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.

A wealthy inventor arrives at Grey Sloan and asks Koracick for help; Meredith struggles to save a woman with diabetes who has been rationing her insulin; Jo and Link fight to save a young man who fell onto train tracks.

Bailey and Ben face a huge, life-altering decision; Meredith and several of the doctors reflect on the past.

Practically raised at Seattle's Station 19, Andy Herrera is a confident firefighter who is also the daughter of Pruitt Herrera, the formidable head of the firehouse. Capt. Pruitt was Andy's primary inspiration to become a firefighter and is a mentor to both her and Jack Gibson, the lieutenant at the station. Jack is as fearless as Andy is by-the-books, but when the two are together, sparks fly and opposites attract. The two are joined by Maya Bishop, Dean Miller, Travis Montgomery, Victoria Hughes, and the station's newest addition, rookie Ben Warren. The team also works closely with Seattle PD, often running into Andy's former flame Ryan Tanner.

At fictional Princeton Plainsboro Teaching Hospital in New Jersey, prickly genius Dr. Gregory House tackles health mysteries as would a medical Sherlock Holmes, all the while playing mind games with colleagues that include his best friend, oncologist James Wilson. House, an acerbic infectious disease specialist, solves medical puzzles with the help of a team of young diagnosticians. Flawless instincts and unconventional thinking help earn House great respect, despite his brutal honesty and antisocial tendencies.

Set in Chicago, this medical drama deals with the personal and professional crises of the doctors in the emergency room at County General Hospital. From the exciting to the mundane, a day in the frantic hospital serves up many interesting dilemmas as well as heartrending choices for everyone on staff.

Annalise Keating (Oscar- and Tony-winning actress Viola Davis), a brilliant, charismatic and seductive professor of defense law, teaches a class called How to Get Away With Murder. Annalise, also a criminal defense attorney, selects a group of students -- the best and the brightest -- to assist with cases at her firm alongside her employees, the trustworthy and discreet Frank Delfino (Charlie Weber) and Bonnie Winterbottom ("Gilmore Girls" alum Liza Weil), an associate attorney. Mysteries arise that test everyone's limits and reveal dark truths.

Shaun Murphy, a young autistic surgeon who has savant syndrome, relocates from a quiet country life to join the surgical unit at the prestigious San Jose St. Bonaventure Hospital -- a move strongly supported by his mentor, Dr. Aaron Glassman. Having survived a troubled childhood, Shaun is alone in the world and unable to personally connect with those around him, but he finds his niche using his extraordinary medical skill and intuition to save lives and challenge the skepticism of his colleagues.