Batman; Jason Todd [first appearance as Robin]; Harvey Bullock; Commissioner James Gordon; Barbara Gordon; Alfred; Julia Remarque [Alfred's daughter; becomes a continuing character]; Vicki Vale; Joker (villain)
Jason dyes his hair and disguises himself as Robin to help fight the Joker.
Justice League International [Batman [Bruce Wayne]; Black Canary; Blue Beetle [Ted Kord]; Booster Gold; Fire; Ice; Guy Gardner; Martian Manhunter [J'onn J'onzz]; Mister Miracle]; Big Barda; Oberon; Catherine Cobert; Rocket Red; The Joker
The Joker attempts to steal a combat tank that Booster and Beetle are trying to repossess while Mr. Miracle tries to assemble a barbecue in time for a party.