The Dangerous Liaisons trailer for Arrow, premiering April 26 Much like Supergirl and The Flash, we’re going to be waiting a while for the next episode of Arrow. Like those shows, the next episode of Arrow won’t air until the week of April 24 (Wednesday, April 26 to be exact), but The CW has already brought online the trailer for the episode, titled “Dangerous Liaisons.” Arrow stars Stephen Amell as Oliver Queen, David Ramsey as John Diggle, Willa Holland as Thea Queen, Emily Bett Rickards as Felicity Smoak, John Barrowman as Malcom Merlyn, with Paul Blackthorne as Detective Lance.