The premise of robots turning on their creators — originating in Karel Čapek's play "R.U.R." and perpetuated in subsequent robot books and films — appears infrequently in Asimov's writings and differs from the "Zeroth Law." In fact, Asimov stated explicitly, in interviews and in introductions to published collections of his robot stories, that he entered the genre to protest what he called the Frankenstein complex—the tendency in popular culture to portray robots as menacing. His story lines often involved roboticists and robot characters battling societal anti-robot prejudices.