Lazlo leaves the babies in the care of their nasty new next-door neighbor, retired Marine Leslie Grisbaum.

Alien cows have come to Earth to feast on the planet's own cows, causing a global milk shortage. It's up to the babies to put a stop to their plans.

A teething Meg goes on a destructive rampage through the city, looking for something to soothe her painful, aching gums.

A trouble-making sprite named Milo pops out of the bathtub with plans to take over the orphanage.

Derrick escapes the orphanage in order to avoid his immunization shot, and ends up infecting the city with a mega strain of chicken pox.

A restless Meg rips off her mattress tag, releasing a swarm of mutant bed bugs all over the city. Once the babies get the idea that the bugs have swallowed Lazlo, they fly into bug-squishing action!

Meg gets adopted by a husband and wife… who just so happen to be aliens from the planet Myanus, a balloon community that lives off farts.

Out at a local seafood restaurant, Derrick gets an allergic reaction to shellfish, causing him to morph into different sea creatures every time he burps.

A visit to the world’s largest ball of string takes an unexpected turn when the babies get taken by a family of hillbillies.

A camp-out in the forest turns into a tree-shaking search when Meg loses her teddy bear Stitchy.

While stranded on an island filled with hideous, mutated creatures, Lazlo gets kidnapped by a mad scientist. It's the Mega Babies to the rescue!

The babies fighting over their Sloppy Meal prize at Barfburger ends with Buck accidentally flushing Meg and Derrick down the toilet. There, they find the restaurant's CEO bent on world domination.

When Derrick gets a nasty ear infection, Lazlo shrinks Meg and Buck down to find the cause and give it a good cleaning.

On their way to claim a prize at Druckey's Diner, Lazlo and the babies get lost on a mysterious freeway, where the freakiest and creepiest reside.

Lazlo creates a formula for cookies that supercharge the brain. When Buck ends up eating one of her cookies, he becomes a genius and eventually takes over the world.

The trio faces off against alien babies in an intergalactic game show.

A trip to the swimming pool turns hectic when a sentient pinkeye virus named Wink joins in and creates a mutant army intent on conquering the city.

Santa Claus is kidnapped by an evil alien planning to take over and put an end to Christmas. And the Perfect Angels Orphanage is his first stop.

The babies face off against a trio of aliens robbing the bank for three of the rarest coins in the world.

The babies get dropped off at a fancy daycare, where their disgusting antics drive the teacher off the wall!

Buck wreaks havoc all over the city with his sleepwalking. When he ends up stumbling into a wrestling arena, it's up to Meg and Derrick to save him.

Derrick unknowingly destroys the planet of a race of alien bees, leading to an all-out invasion that the babies must put an end to.

The babies cause onslaughts of havoc at Follywood, their favorite amusement park.

When Nurse Lazlo gets hit in the head, she starts acting as if she's one of the babies… just as the state inspector comes by for a visit!

Meg gets hypnotized by a group of teenage vampires into helping them build a dome around Your City to block the sunlight.

Just as Lazlo starts potty-training the babies, a diabolical diaper manufacturer brings every toilet in town to life and forces the world into wearing diapers.

After battling so many monsters and aliens, the babies take a stressed-out Lazlo to the beach to relax. The trio drives everyone else visiting mad with their antics, but Lazlo's paranoia and concern for their safety drives her to the brink of insanity!

One rainy day, the babies decide to do some finger painting. Unfortunately, their “paint” turns out to be a toxic substance that ends up bringing their drawings to life and going on a rampage through the city.

An alien race of dill pickles comes to Earth to turn the population into pickles as revenge for eating their species. Meanwhile, they seek to eliminate their biggest threat, Buck.

While visiting the local dump, our heroes meet a recycling-obsessed man who builds a mechanical army that threatens to recycle the whole city.

Lazlo creates a robot dog named Bullet for the babies to play with. It’s not long, however, before he goes out of control and terrorizes Your City.

The babies go to a monster truck show and face off against a trio of AI-powered monster trucks set to destroy the city.

Hankering for a midnight snack, Lazlo and the babies visit an abandoned grocery store, where they end up fighting a mad scientist and his mutated food beasts.

When a giant booger starts hurdling towards the Earth, Grizz convinces the government to send the babies into space to stop it!

When Meg's massive farts cause a hole in the ozone layer, a family of aliens accidentally drops to Earth! Now the babies and Lazlo have to keep them company while finding a way to get them back home.

The babies head to a struggling toy factory to test their products.

A space gypsy is sent to Earth tasked to capture the babies to use them as an attraction to a galaxy zoo. To do this, he creates a voodoo doll of Lazlo and lets the babies inadvertently do the rest.

A trip to the snowy mountains takes a chilling turn when the babies meet a crew of snowboarding punks who are actually aliens planning to freeze the Earth and rocket it away from the sun.