So the press release and stills for the crossover event is out now and from the look’s of it all Katie will not be in it but the good news is she will be in the winter final 6×09 – Irreconcilable Differences.
BLACK SIREN KIDNAPS LANCE— Quentin Lance (Paul Blackthorne) is kidnaped by Black Siren (Katie Cassidy) and Cayden James (guest star Michael Emerson), who are looking to trade Lance’s life for a weapon of mass destruction. Oliver (Stephen Amell) and Team Green Arrow must figure out a way to save Lance while still keeping the city safe.