When Zak visits his bug-scientist (entomologist) grandpa he inadvertently activates the experimental Shrinkinator and wakes up bug- sized in a human-sized world.
Zak trains to be an "Insectible" and goes on his first hunt for a lost Shrinkinator part -- which results in his falling into Adilla's trap.
Willow has to overcome her fear of heights, when she gets snatched by a magpie and taken to its nest. The rest of the Insectibles will have to find a way to rescue her and to get an important Shrinkinator's part.
When Adilla tricks a human kid into dropping a giant lollipop in the yard, the Insectibles have to stop the onslaught of sugar-crazed ants getting themselves stuck to it -- without getting caught themselves.
The Insectibles pretend to be a group of actors in order to gain entrance to the roach's base camp and retrieve a Shrinkinator part. But Zak's delusions of acting grandeur - and a surprise visit from Adilla - ends up turning all of their plans into an off-Broadway blunder.
Zak and Lidia explore new challenges in coexistence when when they find themselves physically stuck together by some sticky tree sap.
The Insectibles are thrown for a loop when they encounter a bar magnet in the yard - set as a trap for them by Adilla. Thanks to Grampa's tinkering, the magnet causes some unexpected chaos as they're carted to Adilla's tower by Hye and Lo.
Separated from his team when they are captured by Hye and Lo, Zak turns to help from a praying mantis kung-fu master... who harbors a big secret.
Zak goes on a daring but comically misguided mission to disguise himself as a roach and go undercover. Things take a turn for the worse when he finds he has to go through Roach Boot Camp.
Willow, determined to prove she can take care of herself, gets trapped under a glass still bearing traces of pink lemonade. High on sugar and running out of time as the glass heats up, she finds she needs the help of her friends... just as they need her quick thinking to get her out in time.
When Chowser tries to convince the team he's seen a giant decapitated zombie, the gang is dragged in to a harrowing adventure that almost makes them lose their own heads.
Grampa's invention of a growth formula turns out to be a brain-switching potion instead! Adilla steals the formula after Zak and Grampa have already switched bodies and, not realizing its true effects, ends up switching bodies with her henchmen! A problem like this will require a lot more brain-switching before everything's sorted out!
A primitive tribe of flies is discovered by the Insectibles. They welcome Willow, to be the guest of honor. Little do we realize it's to become a sacred sacrifice to their god -- a big backyard bug zapper.
Adilla has had it with Hye's and Lo's bumbling and fires them. Unfortunately, the roaches seek new jobs as "good guys" with The Insectibles.
Adilla is called away and leaves her daughter Lidia in charge. The Roach camp is soon thrown into anarchy, until Lidia finally settles on a mission for her minions: kidnap Zak and make him fall in love with her. What could possibly go wrong?
An insane black ant is sure that an ant armageddon has taken place and red ants are after him -- and he thinks Zak and the Insectibles are red ants.
When all of the team's bionics go on the fritz, Gramps has to race to find a solution before their off-brand controller chips go boom!
Zak is faced with an apocalyptic problem as his team turns into brainless zombies during their trek through the mushroom patch. Zak is forced to team up with Adilla to find a solution to the strange plague, all while defending themselves against the approaching horde inside an old water pistol.
Syd finds himself under the spell of an enchanting lady snail - who's using a Shrinkinator part as her shell. Syd has to juggle his loyalty to his team with his new lady love.
Prisoners Zak and Willow are put to the ultimate task... forced attendance at Lidia's birthday party.
The shed is threatened by a mysterious worm with a metal jaw, forcing the team to try and ward it off with special sonic stakes. But when the worm breaches the perimeter, will they be able to save their home?
When Zak takes advantage Chowser's admiration he gets a taste of his own medicine when some ants make him Chowser's Hand Maiden. When Zak fears the ants plan to eat Chowser he has to save his best bud from the lap of luxury.
Gramps and Zak are swallowed by the koi in Gramps' koi pond.
Zak learns why Syd is so cynical when he meets the snail's childhood friends - or is that bullies? Zak wants to prove Syd's worth by challenging the head bully to a race.
When Zak gets an entire family of microscopic dust mites to do his bidding, he convinces his friends that he has "magic powers." But when he tries to use his MAGIC against Adilla, his invisible army gets scared and takes off - leaving Zak and Willow in the lurch!
When Zak's mother sends a pizza to Zak andGramps, The Insectibles and every bug in the yard race to claim it first.
The team awakens to find that Chowser has changed into a butterfly! But with his new body has come a new attitude - rude, selfish and demanding.
A small lens trapped in the waistband of Gramps' full-sized underwear hanging on the clothesline becomes a destruction ray when the sun hits it.
After finding a pair of Ant babies on their doorstep, the team is faced with the toughest challenge of their careers - babysitting.
Zak, Willow and Gramps' search for a shrinkinator part leads them into a 'nut house' for ants. There they must creatively out crazy the crazies to escape with the part.
Upon realizing her abrasive personality is making it harder to negotiate with other bugs, Adilla "recruits" Syd to help her work on her people skills.
After Zak's arm starts going through a series of bizarre malfunctions, the team discovers that Gramps is sleep-tinkering and has to find the cure before it's too late - or Gramps may lose his memory forever!
Gramps orchestrates a camping trip with Zak in order to get a deep, dark secret off his chest. But his efforts to bare his soul are continuously interrupted by the Roaches, sent to spy on the pair by Adilla.
When Zak gets an amnesia-inducing shock, he wanders off to join a tribe of primitive ants where he soon becomes their leader and tries to have the Insectibles tossed.
When Zak finds a prototype jetpack in Gramps' lab, he can't resist strapping it on and taking flight. It soon becomes evident, though, that he's not as skilled a flier as he thinks he is. Can Willow help Zak learn to fly, or will his recklessness blow their chances at getting a Shrinkinator part?
Nothing is as it seems when a beautiful lady caterpillar falls madly in love with Chowser.
Syd gets more than be bargained for when he takes over as the yard's mail carrier and starts mixing up packages while hitting on his customers. Things get messy when he makes a date with three women in the same night.
When Zak is temporarily enlarged to about 3 times his normal size, he discovers that bigger isn't always better.
When Gramps' test of the Shrinkinator goes wrong and turns Zak and Gramps invisible, Zak has to find a missing part to fix everything -- unfortunately, the missing part is on Chowser who's the prisoner of the roaches.
Zak gives Chowser a "lucky locket," which backfires when Chowser decides to confront a rampaging spider.
When Hye and Lo get zapped with a ray that makes them smart, Gramps discovers that their newfound brilliance could be the key to fixing the Shrinkinator. They agree to help, and everything goes smoothly until Zak arrives and mistakes the Roaches helping for them harming his team.
Gramps devises a helmet cam for Zak to wear on the team's missions, so he can offer his advice and wisdom as he watches from the shed. But Gramps' meddling soon causes the team problems in the field.
The team brings Gnat back to the shed after finding him unconscious by a blown fuse box. As Gnat is nursed back to health while Gramps works on the Shrinkinator, the team investigates a mysterious wire leading into the yard. But what does it lead to?
When the roaches find a magic 8-ball keychain in the yard, they welcome it as their wise new leader - abandoning Adilla in the process. Adilla has to team with Zak so they won't destroy the Shrinkinator at the 8-ball's behest.
Willow's drill motor was taken from an old remote control car. Unfortunately Adilla just got the remote control and, with it, control of Willow.
When Zak's arm is upgraded with the ability to project a hologram of himself, Willow convinces him to prank Syd and Chowser. But when Zak gets into some real trouble, his friends don't believe it's for real!
