Writer Dennis O'Neil and artist Neal Adams had their first collaboration on Batman on the story "The Secret of the Waiting Graves" in issue #395 (Jan. 1970). The duo, under the direction of Schwartz, would revitalize the character with a series of noteworthy stories reestablishing Batman's dark, brooding nature and taking the books away from the campy look and feel of the 1966–68 ABC 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." Adams introduced the Man-Bat with writer Frank Robbins in "Detective Comics" #400 (June 1970). O'Neil and artist Bob Brown crafted Batman's first encounter with the League of Assassins in "Detective Comics" #405 (Nov. 1970) and created Talia al Ghul in issue #411 (May 1971).