‘Grey’s Anatomy’ showrunner talks keeping the show’s big reunion a secret

Krista Vernoff says pulling off the return of Patrick Dempsey’s Derek “McDreamy” Shepherd was a career highlight and explains why the show decided to tackle COVID-19 this season.
2:21 | 11/20/20

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Transcript for ‘Grey’s Anatomy’ showrunner talks keeping the show’s big reunion a secret
All right, we'll Tur to last night's dramatic "Grey's anatomy" episode. Patrick Dempsey returning as mcdreamy while Meredith battles covid. Kaylee Hartung, she was lucky enough to sit down with the show runner to talk all about the new season. Reporter: Hey, Cecilia. In the age of Paparazzi and iPhones it's real hard to keep secrets in Hollywood but "Grey's anatomy" did it. How they managed to do it, well, that even shocked the woman in charge. I hate you. You love me. God knows I love you. Reporter: The dream isn't over yet. I'll be right here when you're ready. Reporter: One of television's favorite couples stunning fans and the cast with one of primetime's biggest surprises. Was this one of the toughest secrets you have ever had to keep? The tough effort. The toughest. It was a stressful thing then it was a beautiful group effort then it paid off and I can't believe it. I was in tears. Reporter: "Grey's anatomy" show run Krista vernoff G "Gma" pulling off this was a career highlight. It's just a beautiful nostalgia. For those of us who have lost people like real people in our lives, this gave them room to grieve again or to not grieve again or to feel joy again. Reporter: In the show's 17th season the doctors of grey Sloan are battling the very real virus but vernoff had to be convinced to take it on. The most persuasive were the doctors. They said this is the story of our lifetime and it's changing us and it's changing health care prominently and we have to do it. Reporter: It turns out that reunion was all part of Meredith's own fight against covid. If I fall asleep, I'm afraid I might wake up. The doctors with covid talk about covid dreams and how vivid they are. Covid dreams are intense. We watch these characters for years and fall in love with them and when something like this happens to them we feel it and it might change our hearts a it might change our minds. For me that's as good as it gets. Krista says there are more surpriseness store. Another person from Meredith's past will visit her covid dreams. She wouldn't tell me who but tells me we will get two more appearances from Patrick Dempsey thseason. I'll have my tissues ready for more. Yeah. Totally. I think you break a headline. More Patrick Dempsey. This is big news, Kaylee. Thanks so much.

This transcript has been automatically generated and may not be 100% accurate.

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