“Bridgerton” is a huge success for Netflix, a diamond for a pair of seasons, if you know what I mean. That, of course, means franchising is afoot. “Bridgerton” now exists in the Bridgerton-verse. The streamer has a spinoff of the series on the way from Shonda Rhimes, about one of the best characters: Queen Charlotte, played by Golda Rosheuvel.
“Queen Charlotte: A Bridgerton Story” will be a prequel about the Queen’s marriage to King George. India Amarteifio will play the young Queen Charlotte, and Corey Mylchreest will play the young King George. The cast will also include Michelle Fairley (Catelyn from “Game of Thrones”) as George’s mother. The official synopsis: “This Bridgerton-verse prequel tells the story of how the young Queen’s marriage to King George sparked both a great love story and a societal shift, creating the world of the Ton inherited by the characters in Bridgerton.”
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A few of the “Bridgerton” cast members, including Rosheuvel, will be on hand for the framing story. Adjoa Andoh and Ruth Gemmell will appear as Lady Agatha Danbury and Lady Violet Bridgerton, respectively, as the series also tells their backstories.
When? Netflix won’t provide details, except to say that it will arrive sometime next year.

Matthew Gilbert can be reached at matthew.gilbert@globe.com. Follow him @MatthewGilbert.