Edited sentence: Asimov was delighted with Robby, and noted that Robby appeared to be programmed in his suggested fashion.Robby is one of the first cinematic depictions of a robot with internal safeguards put in place in this fashion.Robby the Robot in Forbidden Planet (1956) has a hierarchical command structure which keeps him from harming humans, even on orders (such orders cause a conflict and lock-up, very much in the manner of Asimov's robots)