Jake Borelli

A sea of patients flood the hospital after gunfire goes off at a parade and a blast from the past throws Maggie off her game on the same day that Meredith tries to talk to her about DeLuca. Owen and Amelia get some potentially life-altering news.

Ties are strained as Andrew and Carina confront an unforgiving family history; Teddy and Owen work together on a married couple that is expecting; Amelia attends a conference for alternative pain relief.

Meredith questions Link's laid-back approach over a patient's treatment. Maggie worries that Richard, Jackson and Catherine haven't come to terms with Catherine's diagnosis.

Maggie introduces mood rooms as an alternative approach to medicine. Alex and DeLuca butt heads over an 11-year-old patient who tries to sabotage her own surgery.

As fog begins to cover Seattle, the doctors must navigate through personal complications. Meredith and Alex attempt to save Gus, and Levi talks some sense into a struggling Nico.

Alex endures an agonising wait for a severely agoraphobic blood donor to arrive from London to save his patient. Elsewhere, Jo opens up to Meredith.