The Riddler is a criminal themed around riddles, puzzles and games, and frequent enemy of Batman. Co-created by Bill Finger and Dick Sprang for Detective Comics #140 (October 1948), Edward "E." Nigma (sometimes Nygma and Nashton), he themes his crimes around these, even leaving clues for Batman and the police to solve hinting to his plans. Whilst not as physically capable as other enemies in the rogues gallery, Riddler is often considered one of Batman's most intelligent foes and has even manipulated others into various schemes. He has also fought other DC superheroes, such as Green Arrow and the Flash, and featured in several "super-villain" teams, including the Legion of Doom and Injustice League. Originally intended to appear once at his first appearance, Riddler became popular after his adaptation in the 1960s Batman series and performance by Frank Gorshin. The character would frequently appear from the 1960s onwards, becoming a recurring enemy to the Dark Knight and his allies. Riddler has also served as the main villain of several stories, most notably being the mastermind of the popular Hush storyline. Due to his frequent appearances in other media, Riddler is often regarded to be one of the core members of Batman's rogues gallery and one of his most popular enemies.