In a move that has left fans of Arrow somewhat mystified Katie Cassidy is set to return as series regular for Season 6.
Arrow’s storyline in Season 4 which revolved around the “Who’s in the box?” question after we found out that someone close to Oliver would be killed over the course of the season was a controversial one.
It was clear that Cassidy would still be appearing in the Arrowverse (CW’s The Flash, Arrow, Legends of Tomorrow) but the decision to have her return as a regular to Arrow is an interesting one it would have seemed more likely that she would have joined one of the other shows as a regular especially given that she will be playing Earth 2 metahuman Black Siren.
Marc Guggenheim Arrow‘s executive producer released the following statement:
“One of the things that most excites us about Arrow is that we go where the story takes us. 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 DC’s Legends of Tomorrow this season show, she never really left the family.”