Arrow’s Katie Cassidy will appear on the penultimate Season 2 episode of The Flash as the Earth-2 version of Laurel Lance aka Black Canary, there known as the Black Siren.

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Arrow executive producer Marc Guggenheim revealed this tidbit at a press screening Monday, also announcing that Cassidy will voice (Earth-1) Laurel on Season 2 of Vixen.Black Siren was never a character in the comics, but rather an alternate universe version of Black Canary who’s one and only appearance was in the “Legends” episode of the Justice League animated series, where she had no “canary cry” and was part of a Golden Age-esque team of heroes called the Justice Guild of America. She was the only female member on the team and performed domestic duties like baking the male members cookies (seriously). Her name there was Donna Nance, and her character was based off the Golden Age version of Black Canary, then named Dinah Drake Lance.

Joshua is IGN’s Comics Editor. If Pokemon, Green Lantern, or Game of Thrones are frequently used words in your vocabulary, you’ll want to follow him on Twitter @JoshuaYehl and IGN