When you see stories about HBO sci-fi/western/mindfuck Westworld recasting, reshooting or shutting down production, remind yourself that HBO went through all of that with Game of Thrones—bringing on David Benioff and D.B. Weiss to rewrite the script and casting Emilia Clarke to play Daenerys—and things turned out OK.

We’ll find out this fall. HBO ran the first full-length trailer for Westworld last night in front of Game of Thrones and closed it with a title card that said “October.” The 10-episode series from Jonathan Nolan (Person of Interest) and Lisa Joy Nolan (Burn Notice) stars a big ensemble cast that includes Anthony Hopkins, James Marsden, Evan Rachel Wood and Jeffrey Wright.

Ed Harris is playing a robot. Hell, maybe everyone’s playing a robot. It’s hard to tell. The series is based on the 1973 Westworld film in which things go a little haywire at a hyper-realistic Old West theme park. Things certainly go a little haywire in this new trailer—gunfire, piles of robot bodies, a man getting marched to the edge of a cliff—which hints at big themes like artificial intelligence, violence and the nature of reality.