With its 15th season, Grey's Anatomy officially becomes ABC's longest-running primetime drama and ties with ER as the longest-running medical drama in the U.S. That's pretty nuts, especially when you consider that it's still one of the most popular shows on TV.
Even this many seasons in, there's still a whole lot going on, and we're keeping track of everything there is to know right here!
Grey's Anatomy season 15 premieres Thursday, September 27 on ABC.