Madden has been focused on her new show, The Gloaming, which comes out on New Year's Day on Stan.

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But she said she thinks she will do more Kettering - and perhaps clear up its infamously ambiguous ending.

"I've been speaking to my co-creator on that show [Vincent Sheehan] about that, because it was always going to be two or three series for us," she said.

Foxtel did not renew The Kettering Incident, despite a critically-acclaimed and successful first season.

Its then-little-known lead actress, Elizabeth Debicki, has since become a megastar.

Debicki is now gracing Vanity Fair covers and starring in Marvel and Christopher Nolan movies. The latter, Tenet, is filming in seven countries and is reportedly the most expensive film Nolan - the director behind The Dark Knight Batman trilogy and Dunkirk - has made.

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Meanwhile, Madden has paired with online streaming platform Stan, which is owned by Nine, for The Gloaming, rather than Kettering's home Foxtel, owned by Rupert Murdoch.

But Madden said the show could proceed regardless of those hurdles. She has previously said further seasons could be a continuation of the same mystery, set in a different time and place.

"We're definitely talking about [more seasons], there's some interest - it could even be next year," she said.

"We [Vincent Sheehan and herself] own Kettering, so it doesn't necessarily have to go on Foxtel. The rights revert to you after a period of time."

The Kettering Incident follows protagonist Anna Macy, who suddenly finds herself back in her hometown of Kettering with no memory of how she got there.

The Gloaming, set in Hobart, follows two detectives with a dark, entwined past, solving a murder that is eerily similar to one 20 years earlier, involving witchcraft, ghosts, and the occult.