Batman [Bruce Wayne]; Batgirl [Commissioner Barbara Gordon]; Commissioner James Gordon (flashback); Flash [Danica]; Mr. Popalopous; Tim Drake [as Joker] (flashback); Ace (a dog); Dee Dee Twins [Delia Dennis (villain); Deidre Dennis (villain)]; Harleen Quinzel (villain); Rigor Morris (villain); Ronald Tagg (villain)