30 Iconic Comics All Batman Fans Must Own
14. Detective Comics #140
This single issue from 1948 was the first appearance of Riddler.
The Riddler AKA Dr. Edward Nygma is a genius who makes Batman's life a misery by constantly committing puzzle-based crimes that really make the Dark Knight think. He has vast knowledge of various sciences and fields and relies solely on his mind to rival Batman - and the fact he still manages to cause him trouble is testament to his intelligence.