EW has learned that
Colin Donnell and Josh Segarra will guest-star in the CW superhero drama’s farewell season. Donnell played Oliver’s best friend Tommy Merlyn in season 1, and Segarra starred as season 5 big bad Adrian Chase/Prometheus; however, fans should expect a twist when they return, because this is
Arrow.
“Adrian Chase comes back in a different way than expected,” showrunner/executive producer
Beth Schwartz tells EW. “We’re really excited about that because obviously he’s one of our favorite villains.” Meanwhile, Donnell is “not coming back as the Tommy we know,” teases executive producer Marc Guggenheim.