Story: "Winning Hand" (22 Pages)

Credits:

Keith Giffen (plot, breakdown pencils)
J.M. DeMatties (script)
Kevin Maguire (pencils)
Al Gordon (inks)
Bob Lappan (letters)
Gene D'Angelo (colors)
Andrew Helfer (edits)

Feature Characters:

Batman
Martian Manhunter
Guy Gardner
Black Canary II
Mister Miracle II
Booster Gold (joins the League)
Blue Beetle II (next in Blue Beetle Vol. 2 #16, then all seven next in Justice League Annual #1)
Captain Marvel (next in Fury of Firestorm #63)

Supporting Characters:

Maxwell Lord (nominates himself official press liason of the Justice League; next in issue #6)
Doctor Light IV (next in Justice League Annual #1)

Villains:

Jack of Spades (last in flashback in Justice League International Vol. 1 #12)
King
Ace, and Queen of Spades (all three last in Justice League of America #205)
Ten of Spades (last in Crisis on Infinite Earths #9; all five as the Royal Flush Gang)