O'Neil's 1970s run on the Batman titles, under the direction of editor Julius Schwartz, is perhaps his best-known endeavor, getting back to the character's darker roots after a period dominated by the campiness of the 1960s TV series. Comics historian Les Daniels observed that "O'Neil's interpretation of Batman as a vengeful obsessive-compulsive, which he modestly describes as a return to the roots, was actually an act of creative imagination that has influenced every subsequent version of the Dark Knight." O'Neil and Adams' creation Ra's al Ghul was introduced in the story "Daughter of the Demon" in "Batman" #232 (June 1971) O'Neil and artist Bob Brown also created Talia al Ghul. During this period, O'Neil frequently teamed up with his regular collaborator Adams (with Giordano often assisting on inks) on a number of memorable issues of both "Batman" and "Detective Comics". The creative team would revive Two-Face in "Half an Evil" in "Batman" #234 (Aug. 1971) and revitalize the Joker in "The Joker's Five-Way Revenge!" in "Batman" #251 (Sept. 1973), a landmark story bringing the character back to his roots as a homicidal maniac who murders people on a whim and delights in his mayhem. O'Neil and Giordano created the Batman supporting character Leslie Thompkins in the story "There Is No Hope in Crime Alley" in "Detective Comics" #457 (March 1976). O'Neil and artist Don Newton killed the original version of Batwoman in "Detective Comics" #485 (Aug.–Sept. 1979). He wrote a short Christmas story, "Wanted: Santa Claus – Dead or Alive", for "DC Special Series" #21 (Spring 1980) which featured Frank Miller's first art on a Batman story.