A long-standing theory here at ComicBook.com gets vindication in a new, extended trailer for Arrow‘s next episode, titled “Heir to the Demon.”Just why have the League of Assassins been so hell-bent on bringing Sara Lance back into the fold? And how much does Oliver Queen already know about Ra’s al Ghul and his family? We get some pretty clear answers in this extended preview, even though it’s only an additional ten seconds over the trailer that aired last night after “Tremors” on The CW.You can check out the teaser below, and the official synopsis of the episode below that.
