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‘Game of Thrones’ Alum Joins Syfy’s ‘Krypton’ as Gender-Flipped Jax-Ur

Hannah Waddingham will play scientist and terrorist leader in Superman prequel series

“Game of Thrones” alum Hannah Waddingham has been cast in Syfy’s “Krypton” in a gender-flipped role.

The actress, who memorably played the bell-ringing, shame-slinging Septa Unella in the HBO series, will recur on the Superman prequel series as a female version of the comic book character Jax-Ur.

Jax-Ur was previously one of Krypton’s greatest scientists with deep ties to the planet’s past, but when the events of “Krypton” pick up, the character is determined to bring radical change as leader of the underground terrorist organization, Black Zero. In the comics, the character has traditionally been male.

Led by newcomer Cameron Cuffe, “Krypton” takes place years before the original Superman story, when the House of El was shamed and ostracized. The series follows the Man of Steel’s grandfather as he fights to redeem his family’s honor and save his beloved world from chaos.

Georgina Campbell, Shaun Sipos, Elliot Cowan, Ann Ogbomo, Rasmus Hardiker, Wallis Day, Aaron Pierre, Blake Ritson and Ian McElhinney also star in the Phantom Four and Warner Horizon Television series. David S. Goyer and Cameron Welsh executive produce.

“Krypton” premieres March 21 on Syfy.