The actress and Broadway legend was confirmed to be joining the WandaVision spin-off back in December, though who she would be playing had remained under wraps.
However, during an appearance on The View, LuPone revealed that she would be portraying Marvel comics character Lilia Calderu, one of the witches in the coven.
"It's a coven of witches, and I play Lilia Calderu – who apparently is in the Marvel world," she explained. "I researched her. She's hot, she's really hot, she's got a great body and hair.
"I didn't know there were witches, I didn't know anything about the Marvel world. There are witches in the Marvel world."
"So, we are a coven of witches and the witches are: Kathryn Hahn, Aubrey Plaza, and [a] Familiar – if anybody knows Heartstopper – is Joe Locke," she went on to tease, describing her character as a "a 450-year-old Sicilian witch whose power is divination and whose trial is tarot".
LuPone also suggested the series will premiere next year, adding: "I think it's gonna be fantastic".
As well as the aforementioned stars, Coven of Chaos is also set to star Emma Caulfield, who reprises her role as Dottie from WandaVision.
Meanwhile, star Elizabeth Olsen has addressed the prospect of her character Scarlet Witch popping up in the show.
"I mean, no, but I would love to pop up," she last September. "I love Kathryn, I don't want to leave her side ever.
"We do think, 'Gosh, we just gotta do it again!' We just had a really great time making that show, and with Paul [Bettany], it was really a special time, so we would love to get the gang back."
Agatha: Coven of Chaos will stream on Disney+. WandaVision is streaming on Disney+.
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