Marium Carvell

Griff completes his proctorship and prepares to make his official return to surgery; hospital board chairwoman Tina Kingsley makes a stunning announcement; the surgical team prepares for a high-stakes lung transplant.

When Amy Taylor (Bethany Joy Lenz) is admitted to the hospital accompanied by her sister, Gretchen (Hilarie Burton), with signs of premature heart disease, Dr. Sam Griffith discovers a deeper medical mystery. Also, Griff anxiously awaits the results of his MRI, hoping to get to the root of his troubling symptoms.

In the wake of Sam's successful execution of a groundbreaking surgical technique, the battle between her and her father, Griff, takes a shocking turn that will irrevocably change their family dynamic and the future of the hospital.

When Dr. Sam Griffith (Sophia Bush) refuses to concede her role as chief, her father Griff (Jason Isaacs) orchestrates a costly surprise. Also, Sam's mother, hospital administrator Vivian (Wendy Crewson), turns to her new spouse, therapist Asher Pyne (Sendhil Ramamurthy), for help navigating the battle between her daughter and ex-husband.

As Sam, Griff and Vivian face the fallout from Griff’s bombshell confession to the hospital board, the surgical team preps for a rare high-profile surgery that could take Sam’s career to the next level. Also, Lex confronts Griff about his betrayal, and Malcolm sets his sights on his mother’s board seat.

Secrets revealed at a major fundraising gala for the hospital threaten to end a tenuous truce between Dr. Sam Griffith and her father, Griff. Also, cardiothoracic resident Dr. Lex Trulie makes a decision that could alter her career trajectory.