According to THR, she will in fact be a series regular once again – as Laurel’s evil Earth-2 doppelgänger Black Siren.
“One of the things that most excites us about Arrow is that we go where the story takes us,” executive producer Marc Guggenheim said. “Last year, the story took us to the tragic death of Laurel Lance. This year, our midseason finale reintroduced us to Laurel’s doppelgänger, Black Siren. We were so taken by Katie‘s fearless interpretation of this character that we knew her story was not yet finished. We couldn’t be more thrilled to welcome Katie back to Arrow as Black Siren, though as her appearances on Arrow and Legends of Tomorrow this season show, she never really left the family.”
Arrow airs Wednesdays @ 8PM on The CW.