Story: "Bipolar Disorder" (22 Pages)

Credits:

Chuck Dixon and Scott Beatty (plot, script)
Darryl Banks (pencils)
Wayne Faucher (inks)
Bill Oakley (letters)
David Baron (colors and separations)
Steve Wacker and Dan Raspler (edits)

Feature Characters:

Superman
Green Lantern (Kyle Rayner) (both last in Action Comics #784)
Flash III (last in Flash #179)
Wonder Woman
Plastic Man (last in Joker: Last Laugh #5)
Martian Manhunter (between Joker: Last Laugh #5 and #6)
Batman (between pages of Joker: Last Laugh #6???)

Villains:

Polaris (between Joker: Last Laugh #2 and #6)
King (of the Royal Flush Gang; last in Joker: Last Laugh Secret Files #1
Ace and Ten (of the Royal Flush Gang)
Doctor Light I
Captain Nazi (both last in Joker: Last Laugh #4)
Tattooed Man

Other Characters:

Katherine
Keith (Antarctic explorers; first appearance; both die)
General Tanner

Comment: Queen and Jack of the Royal Flush Gang revealed to have died as a result of the Joker's serum.