June 26, 2017 at 10:43 AM EDT

Sex and the City

TV Show
Current Status
In Season
run date
Kim Cattrall, Kristin Davis, Cynthia Nixon, Sarah Jessica Parker, Craig Bierko, Sonia Braga, John Corbett, David Eigenberg, Ron Livingston, Kyle MacLachlan, Mikhail Baryshnikov, Chris Noth
guest performer
Candice Bergen, Jon Bon Jovi, Margaret Cho, Alan Cumming, David Duchovny, Evan Handler, Dan Futterman, Willie Garson, Sarah Michelle Gellar, Nathan Lane, Donovan Leitch, Jason Lewis, Lucy Liu, Matthew McConaughey, Anne Meara, Isaac Mizrahi, Bridget Moynahan, Frances Sternhagen, Justin Theroux, Blair Underwood, Vince Vaughn
Julie Rottenberg, Elisa Zuritsky
Drama, Comedy

The biggest Sex and the City mystery, Mr. Big’s real name, was revealed in the series finale. But it turns out that even executive producer Michael Patrick King didn’t know what the moniker would be — or that he’d share it with the audience — until he wrote that final scene.

“In the last episode, in the last moment, I realized [I had] to say Mr. Big’s name and I just [mimes typing on a keyboard] ‘John,'” King tells EW in the video above. “And then I told all the writers and they were like, ‘What the hell?’ And I was like, ‘We have to say his name because now he’s real!'”

In the episode’s final montage, Carrie’s (Sarah Jessica Parker) bedazzled flip phone — it was 2004, after all — displayed the name of her on-again, off-again love (Chris Noth). But as King explains, that wasn’t always the plan. “In my mind? He had no name,” he says. “It was just one of those things where it’s like, ‘Oh, it’s happening right now’ and you didn’t plan it.”

So why did he choose the name John? And what was the other hardest Sex and the City character decision he ever had to make? Watch above and find out!

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