Australian actor Peta Sergeant has been cast as Nyxly, a series regular on the final season of Melissa Benoist’s Supergirl.

Nyxly is described as “a quirky and kind 5th Dimensional Imp, wrongly imprisoned in the Phantom Zone and driven by tragic backstory. She helps Kara when she least expects it, and their budding friendship not only heals some of Nyxly’s emotional pain, but helps Nyxly reclaim her own power.”

The third new episode of the series airs on Tuesday on the CW.

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