November 2020 Station 19 and Grey's Anatomy crossover event

The November 2020 Station 19 and Grey's Anatomy crossover event was a three-part fictional crossover between Station 19 and Grey's Anatomy aired consecutively on the American Broadcasting Company (ABC) in a three-hour timeslot on November 12, 2020. The event began with "Nothing Seems the Same" from Station 19, followed by "All Tomorrow's Parties" and "The Center Won't Hold" from Grey's Anatomy. The crossover served as the season premieres of Station 19's fourth season and Grey's Anatomy's seventeenth season, with the latter continuing into its second episode.

The storyline follows the rescue and treatment of children involved in a car accident, spanning all three episodes. Paris Barclay directed the first part, written by Kiley Donovan, while Debbie Allen directed the Grey's Anatomy episodes. Andy Reaser co-wrote both Grey's Anatomy episodes, with Lynee E. Litt and Jase Miles-Perez contributing to the writing.

Although the event is fictionally set in Seattle, Washington, filming occurred in Los Angeles, California. It also marked the surprise return of Patrick Dempsey as Derek Shepherd to Grey's Anatomy, reprising his role after his last appearance in 2015.

Upon its initial broadcast, "Nothing Seems the Same" from Station 19 was watched by 6.59 million viewers in the United States. It was followed by Grey's Anatomy's "All Tomorrow's Parties" and "The Center Won't Hold," which were watched by 5.92 million viewers. The crossover event received mixed reviews from critics, with praise for its unified storyline and Dempsey's surprise return, but criticism for its writing and execution.