The sci-fi drama from the Buffy the Vampire Slayer creator follows a group of Victorian women who, according to HBO, "find themselves with unusual abilities, relentless enemies, and a mission that might change the world."
The network says it is "following in the footsteps of Buffy with a fantastical story & powerful female characters."
As well as 22-year-old Skelly, the epic series will also feature fellow Irish actress Laura Donnelly, known for her role in Outlander, who was previously announced to have joined the show.
Hooray! I'm so happy now everyone can know that I’ve been working for the past several months alongside this bunch of absolute heroes ???? ?? https://t.co/hGDowCQLyI— Laura Donnelly (@donnellylaura1) July 30, 2019
Donnelly is playing the character Amalia True, described as the most reckless, impulsive, emotionally damaged hero of her time, while Skelly is playing Penance Adair, Amalia's dearest friend and one of the first women to join her cause.
Olivia Williams, James Norton, Nick Frost, Tom Riley, Ben Chaplin, Pip Torrens, Zackary Momoh, Amy Manson, Nick Frost, Rochelle Neil, Eleanor Tomlinson, and Denis O'Hare have also been revealed to be in the cast.
BREAKING | CASTING NEWS | THE NEVERS— THE NEVERS (@HBOTheNevers) July 30, 2019
Olivia Williams, James Norton, Nick Frost, Tom Riley, Ann Skell, Ben Chaplin, Pip Torrens, Zackary Momoh, Amy Manson, Nick Frost, Rochelle Neil, Eleanor Tomlinson, and Denis O'Hare. https://t.co/7in3AO2DWl#JossWhedon #HBO #TheNevers pic.twitter.com/ItjPieZLy4
Whedon created the series and will serve as showrunner. He will also executive produce with longtime collaborators Jane Espenson and Doug Petrie, who are also writing, and Bernie Caulfield.
A scheduled release date for The Nevers has not yet been announced.