- Script
- Jerry Robinson
- Pencils
- Dick Sprang
- Inks
- Dick Sprang
- Colors
- Bob LeRose (color reconstruction)
- Letters
- typeset
- Genre
- superhero
- Characters
- Joker
Introduction by Jerry Robinson
- Script
- Bill Finger
- Pencils
- Ed Kressy (layouts); Dick Sprang
- Inks
- Dick Sprang
- Colors
- Bob LeRose (color reconstruction)
- Letters
- Dick Sprang
- Editing
- Jack Schiff
- Genre
- superhero
- Characters
- Batman [Bruce Wayne]; Robin [Dick Grayson]; Joker (villain); Mr. Hart (villain)
- Synopsis
- Joker has a double, and he's not happy!
- Reprints
Layout pencils verified by Dick Sprang.
- Script
- ?
- Letters
- typeset
- Genre
- biography
Biographies for Jack Burnley, Don Cameron, Whitney Ellsworth, Bill Finger, Horace L. Gold, Pat Gordon, Joseph Greene, Bob Kane, Ed Kressy, Charles Paris, Jerry Robinson, George Roussos, Joe Samachson, Jack Schiff, Ira Schnapp, Dick Sprang & Mort Weisinger.
- Pencils
- Bob Kane; Dick Sprang
- Inks
- Jerry Robinson; George Roussos; Dick Sprang
- Colors
- Bob LeRose (color reconstruction)
- Letters
- ?
- Editing
- Jack Schiff
- Genre
- superhero
- Characters
- Batman [Bruce Wayne]; Robin [Dick Grayson]; Scarecrow; Joker; Alfred Beagle
Reprints covers from Detective Comics (DC, 1937 series) #73, #77, #85, and #86 in less than 1/4 page size on back cover of dust jacket.