Grey's Anatomy

M While Meredith breaks a hospital record, the rest of the doctors are sent scrambling in the wake of a massive overdose within the community.

M A sea of patients flood Grey Sloan Memorial after gunfire goes off at a parade. Meanwhile, Owen and Amelia get some potentially life-altering news about Betty.

M A patient gives Meredith some clarity on her dating situation around the holidays. The strain on Bailey and Ben's marriage comes to a head. Meanwhile, Betty drops a bomb on Owen and Amelia.

M Amelia and Koracick tackle a daunting surgery on Catherine while Richard and Jackson hope for the best. Meanwhile, Richard urges Meredith to visit her father, Thatcher, before his time is up.

M 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.

M The storm continues to blow through Seattle, and after the power goes out at Grey Sloan, the doctors are left scrambling to save their patients' lives.

M Seattle is hit by a huge wind storm and Grey Sloan becomes inundated with patients. Alex and Jo are stuck at home and decide to make the best of it by having a second honeymoon, while Meredith confronts Richard about getting his life back on track.

M Catherine is in Los Angeles getting the new foundation ready and summons Meredith and Koracick to visit for a highly confidential consult.

M Meredith has a patient whose family is celebrating Day of the Dead, making the doctors remember loved ones they have lost.

M Meredith reaches out to Teddy and helps her talk through some of her personal struggles. Owen and Amelia hide out near Betty's school after she becomes a flight risk.