A giant pie is sent to Pretty Big City to stop an asteroid, but the Mechas and their friends accidentally eat it; a quartet of singing stone heads are supposed to perform a concert but they can't stop sneezing.

Ranger Nat gets stuck at the bottom of a crevice with no way to get up, but the problem grows bigger when Mecha Abby gets stuck in a branch trying to save him; Zee tries to launch his rocket into space, but the launchpad breaks.

Berta is taking a picture with Big Old Boulder but the famous boulder rolls down the hill toward the museum; the Mechas must help when the banana atop a banana split statue is not split.

The magnet crane at the construction site accidentally turns on, sucking up all the metal in the city, including Mecha Cookie Monster and Mecha Abby. The other Mechas try to save them.

Hero Celebration Day is capped off with a slide show of everyday heroes, but the Mechas need to save the event when the screen rips, nearly jeopardising the whole day.

Farmer MacBarm hosts the first annual Sunny Field Farm Chicken Roll for the Mechas; Ranger Nat's excitement to see Pinecone's Comet gets squashed.