Sif's coming in for a landing at the rocket launch site, but when her rocket gets pushed off course she needs the Mecha Builders!
A giant pie is sent to Pretty Big City to stop an asteroid...but that discovery is made only after the Mechas and friends have eaten the whole thing!
The Singing Stone Heads are ready to perform at Big Old Boulder Museum, but when they open their mouths, the only sounds that come out are sneezes!
Ranger Nat is stuck at the bottom of the crevice with no way to get up, but the problem grows bigger when Mecha Abby gets stuck trying to save him.
Zee is ready to launch his rocket into space, but when it takes off, the launchpad breaks and the rocket is launched into the farm instead.
Berta is taking a picture with Big Old Boulder for the museum, but needs the Mechas help when the boulder rolls down the hill towards the museum!
It's Food Day in Pretty Big City, but when they unveil this year's statue, they realise the banana atop their banana split statue is not split!
The magnet crane at the construction site accidentally turns on, sucking up all the metal, including some of the Mecha Builders!
Roof is delivering eggs to Marwyn at the Treetop Woods Train Station, that is, until the train pulls into the station and is unable to stop!
Hero Celebration Day is finishing off with a slideshow of everyday heroes, but the Mechas need to help save the event when screen rips.
Pretty Big City is cooling off from a hot day with an ice slide in the park, but the situation gets slippery when the ice slide starts melting.
Farmer MacBarm is hosting the first annual 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, but all of the books go missing! The Mechas need to find them and fast!
The Mechas find Pretty Big City 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, but he needs the Mechas' help to read it.
Zee and MacBarm are setting up their corn maze with the help of Zee's Zee Mobile, but the Mechas are needed when it breaks down.
The Mechas have their hands full when a windmill won't turn, Sunny Field Farm has no power, and Zee can't launch his rocket.
Izzy and Timmy are making a bird caller for Grandma, but need the Mechas to help connect pieces of their machine.
The Mecha Builders help MacBarm bring food to his hungry chickens when all of the food falls out of his truck.
Grandma and her twin sister need the Mechas to help recreate their old zipline act, despite the zipline no longer existing!
Berta is opening an exhibit on the Whatsacallit of Treetop Woods, but needs the Mechas to prove it's real.
Gerry and Nat are leading Treetop Troops on a hike, but Nat finds himself lost in the woods! Can the Mechas get him back before it gets dark?
It's MacBarm's croquet tournament and Zee made giant decorations. The only problem is that they're too giant to get to the farm.
It's the opening day of the skyscraper and the Mechas need to find a way to put the sphere on top of the building before the ribbon cutting ceremony.
Zee's growth ray accidentally turns Moobert giant, but when a storm starts to roll in, the Mechas need to build a shelter big enough to fit her.
After Ranger Nat's kite blows away in the wind, the Mechas and Timmy learn to build their own kite to find it.
When the Martians break the bridge, the Mechas must find a way to help the train cross the ravine.
The Zee Mobile can count chickens at the farm, but needs the Mecha Builders to step in when it won't stop crashing into MacBarm's barn door.
Grandma and Timmy want to carve a sculpture out of stone for an art show, that is, if the Mechas can help them learn how to carve.
Ranger Nat is hiking and finds the Big-Footed Cave Bird. The Mechas realize it can't get back into her home.
Lloyd's testing a wind-up powered go-cart, but the Mechas need to help when it keeps running out of energy.
Sif's coming in for a landing at the rocket launch site, but when her rocket gets pushed off course she needs the Mecha Builders!
When a hat machine malfunctions and it starts raining silly hats on Pretty Big City, the Mechas need to act fast!
Zee makes a giant rocket ship in a bottle, but the Mechas notice things take a turn when he gets stuck inside!
It's MacBarm's day off and Zee is harvesting carrots with his Zee mobile, but the Mechas have to help when it breaks.
Ranger Nat is bringing a playhouse on the train for Timmy and Izzy, but needs the Mechas to fit it through the tunnel!
The Martians come to Pretty Big City but need the Mecha's help when they can't land their spaceship.
Zee needs to communicate with Sif in outer space but the Mechas have to help when a bird makes its home on top of the satellite dish!
The Mechas try to save the day when a big clock breaks in Pretty Big City and no one is able to tell what time it is.
Zee is showing off his inventions, which needs some Mecha help when his rocket powered Ferris wheel goes haywire.
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.
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!
The Mechas need to act quickly when the snowman scarecrow that Zee made for MacBarm keeps blowing away!
It's Halloween and the Zee Mobile is pulling the hayride. The Mechas need to help when the Zee Mobile drives away!
When the ornaments on the Pretty Big City tree break, the Mechas must build new ones and save the holidays for their friends.
