The episode features major developments for several couples, including a massive confrontation between Callie and Arizona regarding infidelity, and Cristina and Owen reaching a crossroads in their relationship.
Meredith Grey goes into labor during the blackout. Due to complications from a previous fall, she requires an emergency C-section performed in the dark, leading to a life-threatening hemorrhage.
A massive superstorm hits Seattle, causing a power outage at Grey Sloan Memorial Hospital and forcing the doctors to work in near-darkness with limited resources.
(The Perfect Storm) is the title of the season 9 finale of the American medical drama Grey's Anatomy .