Detective Comics 640 (1937 1st Series)

Batman tracks the Idiot to Rio, and tries to find the monster’s weakness in “The Idiot Part Four: The Cook, The Bat and The Idiot.” Part 4 of 4, continued from Batman (1940) #473. Written by Peter Milligan. Art by Jim Aparo & Mike DeCarlo. Cover by Norm Breyfogle. Classic line on pg. 1: “All I know is he’ll have to keep eating minds if he’s going to stay real.”