query: When was The Riddler character introduced by DC Comics?
passage: Riddler
The Riddler (Edward Nigma or Nygma) is a fictional supervillain appearing in American comic books published by DC Comics, created by Bill Finger and Dick Sprang. He first appeared in Detective Comics #140 (October 1948). The character is commonly depicted as a criminal mastermind in Gotham City who takes delight in incorporating riddles and puzzles into his schemes, leaving them as clues for the authorities to solve. The Riddler is one of the most enduring enemies of superhero Batman and belongs to the collective of adversaries that make up his rogues gallery.
passage: Hi Diddle Riddle
"Hi Diddle Riddle" was the first half-hour length episode of "Batman" to air, first broadcast on ABC on Wednesday January 12, 1966 and repeated on August 24, 1966 and April 5, 1967. It marked the first appearance of Frank Gorshin as The Riddler.