Story: "Villains United, Part Four: A Weapon To Unify" (22 Pages)

Credits:

Gail Simone (plot, script)
Dale Eaglesham (pencils)
Wade Von Grawbadger (inks)
Pat Brosseau (letters)
Sno-Cone (colors)
Harvey Richards (assistant edits)
Stephen Wacker (edits)

Feature Characters:

Mockingbird III (behind the scenes)
Cheshire
Deadshot
Scandal
Catman (also in flashback in between Green Arrow Vol. 3 #20 and issue #1)
Ragdoll III
Mike the Parademon

Feature Stars:

Firestorm III
Gehenna (both in between flashback and main story in Firestorm Vol. 2 #17; appearances page 19 same as Firestorm Vol. 2 #17, page 2)

Villains:

Calculator
Black Adam (next in Firestorm Vol. 2 #17)
Doctor Psycho
Lex Luthor III
Talia
Deathstroke (in flashback), Weather Wizard
Parasite III (last in ???; next in Firestorm Vol. 2 #17)
Jack of Spades (Deuce Canyard; first appearance) King of Spades (last in ???)
Queen of Spades (last in ???)
Ace of Spades (last in ???; all four as the Royal Flush Gang; all four next in Firestorm Vol. 2 #17)
Queen Bee I (in between flashback and main story in Firestorm Vol. 2 #17)
H.I.V.E. II (last in ???; next in Firestorm Vol. 2 #17)
Tremor
Hindenburg
Lagomorph
Jongleur
Splitshot (speculated to be Awkwardman, Blimp, Dumb Bunny, Merryman and White Feather of the Inferior 5)

Other Characters:

Obrigado (first appearance)
Officer Leavy (behind the scenes)