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Bob puts Leo in charge of overseeing the building of a maze on the grounds of Fixham Castle while he and Wendy refurbish the interior. Scoop encourages Leo to make the maze more difficult and to add mirrors to it, but when the vehicles test it out they all get lost!

Mayor Madison announces that Bob will be the Grand Marshal at the annual parade. He is to ride on a float through the town, so Scoop, Muck and Lofty compete to win the honour. However, they soon discover that each needs the others to complete their build and that they need to work as a team.

After Leo builds a little robotic vehicle to enter in a robo-racing competition, Muck secretly takes 'Whizzer' with him on a build, despite being told not to. When Whizzer goes haywire because it still contains bugs, Muck does his best to solve the problem by himself.

Muck feels terrible when he accidentally collapses Bob's old shed. To make him feel better, while Bob is away getting braces for the rebuild, Scoop recalls how he first met Bob and helped him build it - and the mistakes that the young Bob made along the way. Includes an appearance by Bob's father.

Dizzy is fascinated by the way that the new traffic lights direct the movement of cars. But when she tries directing the team instead of doing her job, all the traffic-light poles fall down, causing the biggest traffic jam in Spring City history!

Scoop meets a bobcat cub, who has become separated from his family by a busy road. Bob and the team build a wildlife corridor so that animals can cross safely, but they have to build it again when Scoop is too impatient to wait for the cement to dry.

Bob and the team are working on a new spiral ramp to make the drive to a bird-watchers' park more direct. Eager to become a champion race car, Scoop tries it out before it is completed, creating chaos and delaying its completion.

The team are building an aviary at the zoo when Scoop hears one of the birds asking Bob to open the cage. He doesn't realise that parrots are just mimics, with the result that he releases the whole flock. Can Bob figure out a way to lure them all back inside?

Bob and the team are adding a wing to the Spring City elementary school, which means that the playground has to be downsized. Saffi asks Lofty to save the elephant ride, but he doesn't tell Bob and causes trouble when he hides it on the roof.

While Bob is away tracking down Cooper, a runaway dog, Lofty and Leo's overcompetitiveness leads to them accidentally destroying the obstacle training course for rescue dogs they are meant to be building.

Lofty is so excited that Leo is returning from his holiday that he steps onto the newly laid runway at the airport and gets stuck in the cement, just as the plane is ready to land.

While building a wind farm, Scoop becomes jealous when Ace pays more attention to newbie Shifter, who keeps making mistakes. He decides to make mistakes too - with disastrous results.

After staying up late watching Ace movies, Muck falls asleep and ends up on a part of a floating bridge that the team are building across the river - and it's heading straight for the falls!

Scoop finds himself zooming around the streets on a jet engine, after he messes around at the scientific test facility that the team are building for Mei Moon.

Two-Tonne's desperation to help a pregnant elephant leads him to make a decision that causes a bridge to collapse - and the elephant to escape!

When Lofty is too embarrassed to admit that he doesn't understand Bob's instructions for the new Spring City canal build, he ends up denting Mr Bentley's boat.

Scoop and Ace are put in charge of decorating two barns for Farmer Pickles. Ace's is very impressive, but Scoop will stop at nothing until his barn is the best...

While Bob and the team are building an aqueduct between Spring City and Fixham, some ducklings mistake Muck for their real mother. When their nest is endangered by the aqueduct, Muck tries to find a way to save the nest and ducklings and get the ducklings back to their real mother.

Lofty is working on a build with newcomer Cherry, whom he wants to impress. Acting on Two-Tonne's advice, he changes his behaviour - but his plans are ruined when Leo's mischievous bot Whizzer shows up.

Scoop accidentally causes a cave-in on a tunnel build, trapping him and Muck underground.

An author is opening a library but Rocky loses her new book. Rocky is inspired by the author's detective novels to track down the missing book.

Roland's rotting grocery store needs demolishing and a modern store building in its place. However, Ace does his famous bucket-waggle dance in front of the store and accidentally sets off the dynamite - and movie director Carl Parker gets it all on film!

Scoop ruins a demolition job to prove that he is not a messy machine.

Wendy is putting on an opera featuring vehicles and people. but Muck's loud singing brings down the ceiling of the old opera house. Bob decides to rebuild the opera house in a Hollywood Bowl bandstand-style, but can the team complete it in time?

When the Town Hall collapses, Rocky thinks that an Abominable Snowman caused it. But the Abominal Snowman is just a myth - isn't it?

While building a river stage for a New Year's Eve fireworks extravaganza, Scoop's over-anxious anticipation of the show nearly blows it up.

Bob and his machines are excited to build Spring City's reservoir, their biggest project yet. But someone on site is scheming to ruin everything.