Carrie thinks she'd make just as good a boss as Bozer and when he gives her the chance she's determined to prove it.
The machines must clear an old dumpsite to make way for a new car park in just one day. Bozer gives the machines a new batch of fuel as a treat but because Carrie is an electric machine she worries because she is different.
It's Maxine's 'mileage day'. Bozer enlists the help of the other machines to organize a Carnival Party to celebrate but it has to be a surprise because Maxine doesn't usually celebrate her Mileage Day and she doesn't like being made a fuss of.
When Diggs starts treating everyday jobs on the construction site as a competition, Bozer decides to introduce a real contest - the Machine Challenge!
When Scooch spills some salt grit, Diggs fills his head with the notion that it is 'unlucky', so when Bozer tells them they are working on top of a very high building, Scooch is terrified. There is a camera feed from the top of the building to a TV below so Bozer asks Carl and Lug to keep an eye on the little machines. And they certainly make for some great viewing as Scooch's worst fears are realized when the lift malfunctions setting him up for a very bumpy ride!
Lug finds it easy to scoff when he sees the newer machines playing at being Big Rig - the superhero truck - everybody knows there is no such thing as "extra vroom". But when Bozer sends him to an unexplored dumpsite and he begins to sink into the unstable ground he soon finds out that there may be just a little bit of Big Rig in all of us.
When Bozer tells Diggs he's full of good ideas he shares them with Scooch and Carrie. But it seems that Carrie's got a few good ideas of her own and they're soon in disagreement.
Diggs and Scooch are working on foundations and are tired and fed up. When Maxine and Lug reminisce about their younger days when they would 'bodge' a job to get it done more quickly, Diggs believes he's on to a winner
Diggs has a shiny new attachment and is very proud of it. That is until Bozer tells him it's needed on an important new job and Diggs realizes that he doesn't know what it does!
Diggs pleads with Bozer to let him wear some new, really fashionable treads. After tearing down an old warehouse, Bozer asks Diggs to check inside the old water cooler before Carl demolishes it.
The new machines have a lot of bricks to move, that Diggs thinks they could use a little help from Maxine. Trouble is, when Maxine gets excited she starts to mix. And what do you get if you mix bricks? Broken stones!
When Diggs, Carrie and Scooch dig a trench in the wrong place they've struck oil. Diggs and Carrie instantly abandon their duties and plan their new life as famous oil barons.
When the younger machines accidentally knock a load of oil drums in the dock they are too scared to own up to their mistake. They take Carl's hook to try retrieving them but things just get worse as the hook falls into the water.
The machines are laying out the site for a new park. When Diggs and Scooch see the plans they figure they can save Bozer some time and just get on with it themselves.
When there's cement mix to be moved and Carrie's feeling fired up, nothing can stop her - nothing except a flat battery that is!
Carrie and Diggs are scouting for rivets for their collections when Bozer tells everyone that today's job is to clear out an old dock. While in the dock, Carrie spots a trunk full of rivets and greedily tries to pick the whole lot up with her forks.
Carl is preoccupied because he is missing the site where he was made. When he almost drops a sewer pipe on Diggs, the other machines decide to try and cheer him up.
Diggs is jealous when Scooch chooses to work with Carrie instead of him. In an attempt to win back his friend's allegiance, Diggs performs his best Carrie voice while silhouetted behind some tarpaulin.
When Diggs saves Carl from a nasty accident, the older machines decide it's time he started hanging out with them. Even the chance to play with Carrie and Scooch can't distract Diggs from his proud new position!
One day as the younger machines play by the docks, Carl and Lug reflect on their own carefree youth. Lug decides that he's not ready for old age just yet.
Everybody's reversing warning is clear and impressive - everyone's except Scooch that is. When his voice is too quiet to stop Lug reversing into a hold he thinks that the older truck will never forgive him.
It's getting dark. Bozer asks Scooch to take some rubble to the junkyard and Carrie and Diggs decide to go along too. Diggs frightens the other two with made up tales of 'Truckzilla'.
Bozer tells the machines that its 'out with the old and in with the new' as they are about to construct their first Prefabricated building.
Diggs, Carrie and Scooch are tired of the old machines always telling them what to do. So when Bozer gives them a whole job to complete all on their own, at first they're sure they can see it through.
Scooch would like to find something he can do that Diggs can't. But when he tries to max out his maximum load all he ends up with is a flat tire.
The machines are demolishing a beacon on the end of the jetty. Diggs discovers Bozer is scared of water, much to Bozer's embarrassment. In an effort to help him conquer his fear, Diggs reverses along the jetty, encouraging Bozer to follow him.
Carrie is a little jealous when the bigger machines get to landscape a new park so she decides to invent her own fork-lifting style. But when she stacks pavement stones for the park like a deck of cards disaster is not far away!
Carl's inventions are legendary...for being a disaster. And when he unveils his new Carl Wash, it's Diggs, Scooch and Carrie who end up being his little wash test dummies.
It's time for the CCT (Construction Certificate Test) and all the machines are very excited. Well, everyone except Carrie whose convinced that the rattle she seems to have developed will scupper her chances of passing.
Bozer gives Scooch the morning off so he'll be rested for a big job in the afternoon. But when the other machines ask for his help, his rest turns into helping everyone else!
When Diggs discovers that Bozer has accidentally dozed a load of gravel over some important bridge roads he faces a dilemma.
Bozer has gone off site and left Carl in charge. Something that always ends in total chaos...Carl even pleads with Bozer not to be left with the responsibility...but to no avail.
When Lug tells Scooch that grading a road on your own is what every dumper dreams of, the little dump truck decides to do a bit of solo grading himself.
The new trucks are thrilled to learn that Dumper the Jumper is coming to town! But Scooch is even more thrilled to find out that Lug used to be a daredevil jumper too and his name was Long Leaping Lug.
A site scattered with piles of materials inspires Diggs to suggest an obstacle race. Almost immediately he and Carrie are competing as to who will be the fastest, leaving Scooch wondering if he's up to the challenge.
Diggs' job doesn't seem as much fun as Carrie's and Scooch's. Moving piles of stones from one place to another is just boring.
Bozer makes Diggs the team leader when the new machines get the job of clearing out an old mine. Unfortunately Diggs takes clearing a bit too far and strips out all the mine supports.
The trucks are working in the snowy mountains where safety is the number one priority and safety gear is de rigor. But Diggs just wants to be a cool sliderdude even if that means wearing his kit in an unsafe way.
Carl and Lug have had a bit of a falling out and have even stopped talking to each other. Even though Bozer tells him it's better to leave them to sort it out on their own, Diggs can't stop himself trying to help them make up
It's the last day in the forest, the machines are finishing up - when Diggs decides to tell Scooch about the legendary 'call of the forest'.
The machines are stuck in the Idle House and wondering what to do, when they come up with the clever idea of telling stories.
Scooch would like a bit more space in the idle house but Diggs and Carrie aren't giving an inch. But when he is the first to take up residence in the new site building, it's Scooch that ends up allocating space.
While Bozer is off-site, Diggs, only half-listening to Maxine, thinks she told him it's OK to do a job on his own. After all, he can dig and carry and dump so why shouldn't he get all the credit!
Carrie doesn't understand how to work her flashy new re-charger - so Diggs takes charge, despite the fact he's got no idea what he's doing.
Carl has to knock a chimney down on the site today, giving him a chance to show why he is nominated for Crane Of The Year. But when, after 25 swings, he still hasn't hit it, he loses his confidence.
Due to a wall of ice, the machines are stuck on a slippery mountain road. So while Bozer and Lug set off to get salt grit, Carrie encourages the others to keep warm by performing a Parp Song Contest
When Diggs overhears Bozer talking to himself, it seems that their beloved boss is going to be leaving. What can the construction machines present him with as a farewell gift?
The machines are shocked to find that during the night the new multi storey car park they were building has been destroyed.
A new dump truck has come to the site - Skatch. He's so exciting and so much fun that Diggs and Carrie seem to be ignoring their old pal, Scooch.
Bozer returns from a servicing only to find that his big deep boomy boss voice has changed to something very high and squeaky! This starts him worrying about whether he'll be taken seriously as a boss any more.
It's very cold today and Bozer reminds the machines to put in their anti-freeze. Trouble is, he's so busy reminding everyone else that he forgets to put some in himself.
The new machines are at the docks. Their job is to shift supplies to a cargo vessel. Diggs assures Scooch and Carrie that they have plenty of time to do the job AND help him take a few shiny things back to his collection.