| Issue | #21 |
| Published | November 2008 |
| Cover Price | 2.99 USD; 2.99 CAD |
| Pages | 36 |
| Editing | Mike Carlin; Tom Palmer, Jr. (associate) |
| Characters | Batgirl [Barbara Gordon]; Scarecrow [Jonathan Crane]; Clayface; Two-Face [Harvey Dent]; Mad Hatter [Jervis Tetch] |
| Genre | Superhero |
| Pencils | Kevin Maguire |
| Inks | Kevin Maguire |
| Colors | Kevin Maguire ? |
| Characters | Batgirl [Barbara Gordon]; Catwoman [Selina Kyle]; Batman [Bruce Wayne]; Blockbuster [Mark Desmond] (villain); Catman [Thomas Blake] (villain); Cavalier [Mortimer Drake] (villain); Clayface [also as Robin] (villain); Joker (villain); Riddler [Edward Nigma]; Scarecrow [Jonathan Crane] (villain); Signalman [Phillip Cobb] (villain); Two-Face [Harvey Dent] (villain) |
| Synopsis | Batgirl must survive a night in Arkham Asylum in order to get her father's notebook back. |
| Genre | Superhero |
| Script | Fabian Nicieza |
| Pencils | Kevin Maguire |
| Inks | Kevin Maguire |
| Colors | I.L.L. |
| Letters | Sal Cipriano |
| Characters | Batman [Bruce Wayne] |
| Script | Ian Sattler |
| Pencils | ? (photo) |
| Inks | ? (photo) |
| Colors | ? (photo) |
| Letters | typeset |
| Notes | Ian Sattler talks about keeping Kevin Smith's new Batman project a secret. Hot list - DC UNIVERSE: DECISIONS #1, FINAL CRISIS: REVELATIONS #2 and TRINITY #15. House ad for BATMAN CONFIDENTIAL #22. |