User blog comment:MrAnonymous/Will Vertigo play a major role in the series?/@comment-807326-20130129055356

Unfortunately, he will. But if Arrow ends up getting more series, I have a feeling that they'll bring back these characters and play out more stories with them. It's possible all the baddies will, in future, end up teaming together and face off against Arrow, much like the aliens did against the Doctor in Doctor Who's series five two-part finale.