Detective Comics #168

1. Cover by Lew Schwartz and Charles Paris.
2. "The Man behind the Red Hood!" written by Bill Finger, penciled by Lew Schwartz and inked by George Roussos.
3. "The Electric Thinking Cap" written by Unknown, penciled and inked by Dan Barry.
4. "The Return of the Iron Man" written by Unknown, penciled and inked by Frank Bolle.
5. "Ten Little Indians" written by Unknown, penciled and inked by Bruno Premiani.

Batman is tracking down a ten year old case with the help of some class mates. That's right; Batman is teaching a course on criminology. There are many clues indicating who has done the old crimes, such as a lock of green hair is found and who else but the Joker would be so smart as to create two-way red lenses? Joker's origin is shown for the first time in this detective comic.