When the Mechas notice a giant pie floating above Pretty Big City, they slice it up to share with all their friends. Pie for everyone! After the last slice is gone, the team learns that the pie was sent by some friendly aliens to stop an asteroid! Now it’s up to the Mechas to find something else to catch the asteroid.
A quartet of singing stone heads are ready to perform at Big Old Boulder Museum … but they can’t stop sneezing! The Mechas have to go “Mecha Tiny” to figure out what’s causing the sneezing, and work together to solve the problem before the concert.
The Mechas arrive on the scene to help a park ranger stuck at the bottom of a crevice. The problem multiplies when Mecha Abby gets stuck on a tree branch trying to reach him. The Mechas need to find a way to lift heavy things so they can free Abby from the tree and lift the ranger out.
The Mechas’ friend Zee is ready to launch his rocket into space, but a launchpad malfunction sends the rocket flying off to the farm instead. Once the Mechas get the rocket back to Zee’s launchpad, they need to figure out how to point it back up toward the sky in time for liftoff.
Berta is taking a picture with the Big Old Boulder for the city’s museum, but she needs the Mechas' help when the boulder starts rolling down a hill! The Mechas work together to get the rock back up the hill -- and keep it there!
It’s Food Day in Pretty Big City, and the city is celebrating by unveiling a banana split statue! But when the statue is revealed, the banana atop the banana split statue is not split! The Mechas need to fix it quickly, before everyone’s Food Day ice cream melts.
The magnet crane at the construction site is switched on by mistake, sucking up all the metal in the area -- including Mecha Cookie and Mecha Abby! The Mechas learn about magnetism as they figure out how Mecha Elmo can stop the pull of the magnet before anything – or anyone! – else gets trapped.
Marwyn is waiting for an egg delivery at the Treetop Woods Train Station. When the engineer tries to stop the train, the brake lever snaps! The Mechas try different ways to stop the train without breaking any of Marwyn’s eggs.
Hero Celebration Day is coming to an end; the big finale is a slideshow of the everyday heroes of Pretty Big City. When the screen rips during the event, the Mechas need to find something flat and opaque to show off the photos and celebrate the city’s heroes properly.
The people of Pretty Big City are cooling off on a hot day with an ice slide in the park … but the situation gets slippery when the ice slide starts melting. The Mechas hunt for something to slow down the melting process and protect their friends’ summer fun.
Farmer MacBarm is hosting the Sunny Field Farm Chicken Roll, but the race gets off to a slow start when the chickens don’t roll.
Ranger Nat can’t wait to see Pinecone’s Comet, that is, until his telescope falls to the bottom of a cliff.
It’s the Pretty Big All City Read and Izzy and Barb are ready, that is, until all the books go missing! This episode features a special appearance by the Martians.
Pretty Big City finds itself in a sticky situation when the factory starts spewing super sticky slime everywhere!
Ranger Nat’s hike turns to adventure when he finds a treasure map. The only problem is that he can’t read it.
Zee and MacBarm are setting up their corn maze with the help of Zee’s Zee Mobile… that is, until it breaks down inside the maze.
The windmill isn’t turning, which means Sunny Field Farm has no power. The windmill needs to turn again so Zee can launch his rocket!
Izzy and Timmy are making a bird caller for Grandma, but have trouble connecting pieces of their machine.
MacBarm is bringing his chickens a new trough full of feed, but it falls out of his truck and breaks.
Grandma and her twin sister want to recreate their old zipline act, but quickly discover that the zipline no longer exists!
Berta opens an exhibit on the Whatsacallit
Gerry and Nat lead the Treetop Troops on a hike.
MacBarm's croquet tournament
it's the opening day of the skyscraper.
Zee's growth ray turns Moobert giant
Ranger Nat's kite blows away in the wind
The train needs to cross the ravine
The Zee Mobile is great at counting the chickens at the farm
Grandma and Timmy enter the Pinecone Art Show
Ranger Nat is hiking.
When the ornaments on the Pretty Big City tree break, the Mechas must build new ones and save the holidays for their friends.
It's time for Zee and MacBarm's gift exchange, but the snowman scarecrow Zee made for MacBarm keeps blowing away!
Lloyd's testing a wind-up powered go-cart, but a problem arises when it keeps running out of energy.
Sif's coming in for a landing at the rocket launch site - until her rocket is pushed off course by a satellite!
Lloyd is selling silly hats at the factory, but when the hat machine malfunctions it starts raining silly hats on Pretty Big City!
Zee makes a giant rocket ship in a bottle, but things take a turn when he gets stuck inside!
It's MacBarm's day off and Zee takes over harvesting carrots with his Zee mobile, but when it breaks, the work still needs to be done.
Ranger Nat is bringing a playhouse on the train for Timmy and Izzy, but it won't fit through the tunnel!
The Martians come to Pretty Big City but find themselves in need of help when they are unable to land their spaceship.
Zee needs to communicate with Sif in outer space but can't because a bird has made its home on top of the satellite dish!
Panic erupts in Pretty Big City when the big clock breaks and no one is able to tell what time it is.
Zee is showing off his inventions at his rocket-powered show, including his latest creation, a rocket powered Ferris wheel.
Cows keep leaving the farm. It's up to the Mechas to solve the mystery of how they keep disappearing.
Marwyn attempts to make Pretty Big City's largest cookie, but to do so, he'll need a lot of Mecha help.
TBA
Timmy can't wait to trick or treat as a Mecha T-Rex, but needs the Mechas' help when he can't reach the arms of his costume.
The Martians help Lloyd deliver packages, but the Mechas see they keep breaking when dropped from up high.
The Mechas have to help when a slide sends people all the way across the farm, where they spend more time walking than sliding.
Izzy and Timmy try to dig up treasure at the top of Lawrence Pinecone's Statue's shadow. The Mechas help when they find nothing's there!
The "Pretty Big Thing" is scaring people from going to work. The Mechas must find out what it is!
When super sticky slime spills on Zee and MacBarm, the Mechas have to figure out how to pull them apart.
When Marwyn runs out of ice, the Martians send a giant hunk of ice. The Mechas have to stop the ice from sliding into a skyscraper!
