Terry's Family Studies teacher gives the class an assignment: to learn about the responsibilities of parenthood, they have to take care of an egg. The familiar exercise is given a high-tech twist -- each 'eggbaby' has sensors which register the amount of care it receives and a computerized feedback system causes it to coo, cry, and giggle like a real baby.
When Terry's assignment partner, vain cheerleader Blade Summers, unceremoniously dumps the eggbaby on him, he's forced to carry it with him when he's out as Batman -- even while chasing the notorious Ma Mayhem and her gang as they commit a series of daring ruby thefts.
It's been years since Batman was last seen and Bruce Wayne secludes himself away from the resurgence of crime in Gotham. After discovering Bruce's secret identity, troubled teenager Terry McGinnis dons the mantle of Batman. With Bruce supervising him, Terry battles criminals in a futuristic Gotham and brings hope to its citizens.