The writer of the upcoming Stranger Things spinoff comic Into the Fire Jody Houser has opened up about the parameters set when it came to expanding the universe of the popular Netflix show.

"I mean, we’ve been given, actually, more freedom than I expected, honestly," she told Gizmodo. "Especially in terms of creating new characters from the program. Really the one restriction we got was we couldn’t use the number One. Other than that, any other number was up for grabs. I was able to put in a 9.5, cause there’s set of identical twins and one has powers and one doesn’t."

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"That was just, sort of, the one note and it’s just like, 'Hmm. I can’t wait to see what that’s all about,'" she added.

Created by the Duffer Brothers, Stranger Things stars Winona Ryder, Millie Bobbie Brown, David Harbour, Finn Wolfhard, Gaten Matarazzo, Caleb McLaughlin, Noah Schnapp, Natalia Dyer, Charlie Heaton, Joe Keery, Priah Ferguson, Cary Elwes, Jake Busey and Maya Thurman-Hawke. The first three seasons are available on Netflix, with a fourth currently in development.

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Stranger Things: Into the Fire #1, by Jody Houser, Ryan Kelly, Le Beau Underwood, Nate Piekos and Triona Farrell, goes on sale Jan. 8 2020 from Dark Horse Comics.