- Script
- Karl Kesel (credited)
- Pencils
- Terry Dodson (credited)
- Inks
- Rachel Dodson (credited)
- Colors
- Alex Sinclair (credited)
- Letters
- Ken Lopez (credited)
- Genre
- superhero
- Characters
- Buster (guest) (first appearnce); Commissioner Gordon; Jack Happi (guest) (first appearance); Di Happy (guest) (first appearance); Harley Quinn [Harleen Quinzel]; Joker (guest); Lewis LeBeau (guest) (first appearance); Poison Ivy [Pamela Isley]; Bruce Wayne; Martin (first appearance, guest, death); Batman (actor, cameo); Robin (actor, cameo); Joker (actor, cameo); Catwoman (actor, cameo)
- Synopsis
- Harley breaks into Arkham to break the Joker out. Joker sends Harley and the gang to ruin mobster Jack Happi's Gotham crime-themed amusement park by altering Happi's 'Jokester' rollercoaster ride into a real killer. Mr. J decides to breakup with Harley permanently.
- Reprints
First 6 pages are drawn in the Batman Animated style.
- Script
- Matt Idelson
- Pencils
- Terry Dodson (signed as Dodson)
- Inks
- Rachel Dodson (signed as Rachel)
- Colors
- ?
- Letters
- typeset
- Genre
- superhero
- Characters
- Batman [Bruce Wayne]; Harley Quinn [Harleen Quinzel]; Joker; Two-Face [Harvey Dent]
Introduction to the comic; unused cover for Harley Quinn #1; cover art for Harley Quinn #2. Also DC publisher credits.