Dates
- Cover date
- August 2009
- On sale
- June 24, 2009
- In stores
- June 24, 2009
- Pages
- 36
Values
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Editions and covers (4)
Copies of #1 are not all the same book. Here is how to tell each one apart.
- 2nd printing
Second Printing
Marked as a later printing on the cover or in the indicia.
Barcode 76194127317400112
This edition’s page 
Variant CoverMetronSource ↗
Story arc: Batman: Reborn
This is part 6 of 23. Reading order by cover month and on-sale date; arc records can be incomplete.
- Batman #687
- Red Robin #1
- Batman: Streets of Gotham #1
- The Outsiders #19
- Detective Comics #854
- Gotham City Sirens #1
- Batman #688
- Red Robin #2
- Batman: Streets of Gotham #2
- Gotham City Sirens #2
- The Outsiders #20
- Detective Comics #855
- Batman #689
- Red Robin #3
- Batman: Streets of Gotham #3
- Detective Comics #856
- Gotham City Sirens #3
- Batman #690
- Red Robin #4
- Batman: Streets of Gotham #4
- Detective Comics #857
- Gotham City Sirens #4
- Batman #691
Creators
Stories
- Union · 22 pages
Catwoman, Harley and Ivy decide to team-up and move in together.
Publisher’s description
Hang out with the bad girls of Gotham City! Catwoman, Poison Ivy and Harley Quinn are tired of playing by other people's rules--regardless of which side of the law they're on. These tough ladies have a new agenda all their own, and they'll use any means necessary to pursue it. But can they get along and work as a team? And who will get hurt along the way?
Reprinted in
Gotham City Sirens: Union (2010), Gotham City Sirens: Union (2011), Gotham City Sirens (2014), Catwoman: A Celebration of 75 Years (2015), Harley Quinn & the Gotham City Sirens Omnibus (2018), Harley Quinn & the Gotham City Sirens: DC Compact Comics Edition (2024)