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Robot heroes in training Elmo, Cookie Monster, and Abby Cadabby use their STEM superpowers to solve wacky larger-than-life problems.
A giant pie is sent to Pretty Big City to stop an asteroid… but the Mechas and friends have eaten the whole thing!
The Singing Stone Heads are ready to perform at the Museum, but when they open their mouths, they sneeze instead of sing!
Ranger Nat is stuck at the bottom of the crevice, but the problem grows when Mecha Abby also gets stuck.
Zee is ready to launch his rocket into space, but when the launchpad breaks, the rocket is launched into the farm instead.
When Big Old Boulder rolls down the hill towards the museum, Berta needs the Mechas help to keep it stable.
It's Food Day in Pretty Big City, but the Mechas need to help when the banana atop the banana split statue is not split!
The magnet crane at the construction site accidentally turns on, sucking up all the metal, including the Mecha Builders!
Roof is delivering eggs to Marwyn at the Train Station, that is, until the train pulls into the station and can't stop!
Hero Celebration Day is finishing with a slideshow of everyday heroes, that is, until the projector screen rips.
Pretty Big City is cooling off with an ice slide in the park, but the situation gets slippery when the slide starts melting.
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!
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 food to his hungry chickens, that is, until all of the food falls out of his truck.
Grandma and her twin sister want to recreate their old zipline act, but quickly discover that the zipline no longer exists!
