Terry is failing his Family Studies course. His teacher offers him one more opportunity to pass: a project in which he has to take care of an Eggbaby as if it were an actual child. Unfortunately, his assigned partner Blade dumps the entire project on him. This, combined with the arrival of a new gang of villains in Gotham, forces Terry to take the Eggbaby along with him on his missions as Batman.
- Abusive Parent: Ma Mayhem towards her two sons.
- Babysitter from Hell: Sort of. While Terry does score an A on the assignment due to the amount of excitement and emotional stimulation he gave it, the teacher would likely not be so approving if she knew how it happened.
- Berserk Button: Do not remind Ma Mayhem that her husband abandoned her to run off with a younger woman.
- Brawn Hilda: Ma Mayhem, again.
- Egg Sitting: Terry is forced to care for an Eggbaby for a school assignment while also working as Batman.
- Emmy Bait: Word of God admits that this episode was intentionally designed to be more lighthearted compared to the otherwise dark show in an attempt to win an Emmy award. It worked.
- Fat and Skinny: Carl and Slim, Ma Mayhem's two sons.
- Fate Worse than Death: Terry views having to take Family Studies over again would be this.
- Genre Throwback: In contrast to most of Terry's opponents, who tend to have advanced futuristic superpowers, Ma Mayhem is much closer to the quirky villains of the original Batman's classic Rogues Gallery.
- Getting Crap Past the Radar:
- When Bruce hears the Egg Baby's crying through the comm-link and asks if Terry brought a baby to the mission, his reaction implies something about where he's assuming the baby came from.
- It turns out that Terry receives the highest grade in class for the project because he not only took care of his Eggbaby but also gave it the most excitement and emotional stimulation. His teacher lauds him as being excellent father material. Terry is at first ecstatic, but then he notices the suggestive grins from ever girl in class...
- Carl implies that Ma Mayhem's husband left her for another woman.
- Hidden Depths: Nelson doesn't mind the assignment at all, and takes sole responsibility for his egg (in exchange for Max doing homework for both of them).
- Karma Houdini: Minor example with Blade; she doesn't contribute to the assignment at all, but still aces it because of Terry.
- Lighter and Softer: The producers stated that they brainstormed this episode's plot by thinking of the funniest and most ridiculous plots that they could put Batman in.
- Loving a Shadow: Ma Mayhem is in such willing denial that her husband dumped her for a younger woman she believes he was a good man who suffered an untimely death. The minute one of her kids attempts to set her straight, she smacks him for speaking poorly about his father.
- Parental Neglect: Virtually, Blade proves to be a poor mother, never helping with the eggbaby and always leaving Terry to take care of it all by himself.
- Parents for a Day: Terry becomes such for his Eggbaby.
- Reality Ensues: Of course Terry's grades are in trouble. He spends all his time beating up criminals. Lampshaded by Bruce.Bruce: How do you fail Family Studies?
- Robot Buddy: The Egg Baby is a pain, but it unintentionally helps Terry a lot, crying in fear at the sight of Ma Mayhem and her sons, becoming something of an alarm when they try to sneak up on him.
- Seen It All: When Terry swiftly retrieves his Eggbaby from the dumpster where he left it, before it's hauled away by a garbage truck:
- Teen Pregnancy: What Bruce initially assumes of Terry when he first hears the Eggbaby's cries.Bruce: Terry, is there something you need to tell me?
- Villainous Breakdown: Ma starts pathetically sobbing after she watches all the jewels she stole tumble out of her purse since she stupidly forgot to turn the purse over after Batman saved her.
- You Have Got to Be Kidding Me!:Bruce: Even real parents with real children find ways to get away for a night.
Terry: I tried leaving it with my mom, but she said she was too young to be a grandmother.
Bruce: What about your brother?
Terry: I tried that, too. Then I caught him shooting rubber bands at it. Hey, you know, maybe you could...
(Bruce gives him a Death Glare)
Terry: Never mind.