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.

Malcolm is upset about having to dance in front of the school with the other Krelboynes, so he decides to ditch school. But when Hal convinces him that taking him to school will be the highlight of his day, so Malcolm is guilted into going. The boys are shocked though when Hal tells them they aren't going to school. He takes them to the racetrack to see the last race of the best driver ever Rusty Malcolm. After two laps, the boys decide to get some cokes. While arguing over who should watch him though, the boys lose Dewey and enter a forbidden room, only to be caught by a security guard. Meanwhile, Francis' disobedience affects the rest of the cadets.