On the hottest day of the year, when the trainees are going to help Frostini deliver ice cream, there??s a power failure and it looks like all the ice cream will melt! Speedy has an idea: he and Frostini will go to the ice caves in the mountains and bring back ice to keep things cold. Meanwhile, the trainees must look after the refrigerator cars.

Calley is teaching Hoot and Toot how to use the sliding turntable. When she gets called away on an emergency, she asks Brewster to take over the training. The twins find Brewster??s methodical way of teaching a bit boring and make their escape. Brewster chases them all over the depot. The twins accidentally get on the track lift, which sends them straight underground.

Action Chugger is in town making a movie and Emery lands the exciting job of assisting on the film set. Brewster is a little envious, especially as his job for the day is litter-picking. He worries that his fellow chuggers think he??s a bit dull. Calley tells him that a job is what you make it and shows him that the litter-picking wagon can do some cool things.

Nobody wants to go down the mine to collect the rolling stock for cleaning, so Speedy suggests they settle it with a chug of war! Two teams will face each other across a bridge with a piece of rolling stock between them. The first team to pull the rolling stock off the bridge is the winner and the losers will clean the mine. Harrison captains one team, Speedy the other.

It's a windy day in Chuggington, which is causing lots of problems. Eddie has a list of jobs as long as his arm! Hodge really wants to help. Some fencing needs to be delivered, but the hooks that hold the tarpaulin down over the load are missing. As Eddie dashes off to yet another job, he asks Hodge to pick up some more hooks. Farmer Felix is anxious to get his fencing before his animals escape. Not realising he actually needs the hooks to keep the tarp secure, Hodge decides it would really help if he took the fencing with him on his way to pick them up. On his travels, the wind works the tarp loose. It affixes itself to Hodge, turning into a kind of sail. It whizzes Hodge along and lifts him high in the air, sailing him all round Chuggington. Eventually it drops him back in the depot. When Eddie learns that Hodge has inadvertently fixed everything on his 'to do' list in the process, he thinks Hodge should sail away more often!

When Emery takes reporter Rag around town as he covers exciting news stories, he wishes he could get his picture in the paper! Rag tries to get an interview with the famous magician, The Magnificent Mysterioso, who has come to Chuggington to do a show. As Emery waits, he sees his chance. Smoke! The stage must be on fire! Emery uses a water cannon to put it out.

Hoot and Toot are double ended shunting chuggers. Hoot gets fed-up of Toot always being at the front, so Toot agrees to let him lead for the day. Hoot mixes up a delivery of red tomatoes and green apples. He also refills the spray shed with the wrong colour paint and Wilson is sprayed green instead of his usual red! Toot is upset with Hoot for getting everything wrong.

Dr Ling is experimenting with a new invention that can help chuggers increase their speed - the Booster! Brewster helps her to test it. The new booster makes him go super-fast, but it has some terrible side effects. Brewster gets a lot of attention and loves being thought of as a speedy engine, so he says nothing about the problems.

Hodge loves Chuggington Quiz Night – so when quizmaster Harrison loses his voice, Hodge volunteers to take his place. But he has a really busy workday with Eddie and doesn’t get any time to think up his questions. To try to save time, Hodge overloads himself and breaks his axle. Because Hodge is one of a kind, they won’t be able to find a replacement in time for him to host the quiz.

Wilson is given the important job of taking some photos, to be used on a poster promoting Chuggington. Meanwhile, Dr. Ling has a special assignment for Hoot and Toot: pulling a robotic dinosaur around town to promote a new exhibition at the museum. Wilson isn't having much luck taking exciting pictures - until he sees the dinosaur go by. Wowzer! He has to get a photo of that! He chases after it, but unfortunately has a collision. His camera flies off and lands out of reach - just as Hoot and Toot arrive with the dinosaur. Hoot has an idea. Extending the dinosaur's neck, and using its jaws to grab, Hoot and Toot reach up and retrieve Wilson's camera. The camera goes off while it's in the dinosaur's mouth - giving Wilson the perfect shot of Chuggington he needs!

The trainees are learning how to use their snowploughs, snow horns and snow lanterns, but have yet to experience real snow. When a blizzard comes in, it's all chuggers to the rails! Wilson goes out with Harrison, promising to stick very close to him. Unfortunately, he gets distracted by some children building a snowman, and falls behind.

It’s a cold, snowy day in Chuggington and every available chugger is heading out to plough – except for Chatsworth, who is going for a rest after ploughing all night, and Hoot and Toot, who are too inexperienced to be out in the snow. Koko and Harrison head off as a team, Harrison boasting there isn’t a drift that can stop him!

Eddie and Hodge have cleaned the sludge out of the chugwash. Now they’re going to refill the chugwash soap, then clean the underground tunnels using the Scrub-A-Chug – a fantastic piece of rolling stock with brushes that cleans the ceiling of the tunnel. Their work is interrupted when they get called away on an emergency.

Dr. Ling is giving a talk about meteors and how, many years ago, one crashed right near this area. Brewster pulls in a real meteorite, borrowed from the museum. Dr. Ling demonstrates that you can move the meteorite with a magnet, as meteorites contain metal. Hoot and Toot are afraid the meteorite might escape and destroy Chuggington, so they decide to return it to space.

An ice storm hits Chuggington and Koko really wants to help. She sees her chance when she comes across one of the anti-freeze cars. She thinks she's de-icing the tracks, but she's actually making them even icier - she doesn't realise that the car contains water. Because of her actions, Eddie and Emery get stranded out in the cold. Koko admits her mistake and does what she can to help Calley rescue them. When Eddie and Emery are back, safe and warm, Koko promises she'll never do anything like that again without checking with someone first!

The trainees are having an exciting stunt training session with Action Chugger, when he is called away to do some filming. As he leaves, Action Chugger invites Brewster and Koko to come down to the film set later to demonstrate the skills they have learned. But Brewster gets called on a long run to Tootington and has no time to practise. Koko goes with him to keep him company.

On an icy winter's day, Wilson and Koko are sent out to sand the tracks in the mountains. They take a short cut through the ice cave. Koko does everything properly, but Wilson doesn't keep his mind on the job, as he has fun exploring. He doesn't realise that an icicle has fallen into his sand wagon, wetting the sand and rendering it useless. He's stuck! He figures out a way to dry the sand by using the heat from his engine and makes it back to the depot - after finishing his job, of course!

Border Bridge is re-opening and Wilson has been given the special job of using the new 'rolling reporter' car to make a live report, which will be broadcast on Vee's boards all over Chuggington. Wilson takes the car out to practise and comes across Calley training Hoot and Toot. When an emergency call comes in, Calley asks Wilson to look after the twins. They offer to help Wilson practise his report, but instead, they run off with the camera car and end up lost in the ice cave. Happily, the camera is transmitting, so using Vee's boards, Wilson is able to track them. He rescues them and the car and manages to get to the bridge just in time - and Rolling Reporter Wilson is on the air!

It's another glorious day in Chuggington and Zephie is keen to enjoy the sunshine, but every job she is given is underground. Meanwhile Speedy is out in the countryside serving drinks with the juicer wagon, when he'd rather be doing a proper job at the depot. They agree to swap jobs. While trying to operate the juicer, Zephie accidentally knocks a beehive out of a tree. The bees swarm into Zephie's carriage, looking for a new home. Speedy comes to her rescue and together they find the bees a new, safe place to live.

Brewster is going to be carrying Mayor Pullman, the new Mayoress of Chuggington, across the newly re-opened Border Bridge in the traditional welcoming ceremony. During the practise run, some of the facade falls off one of the bridge's pillars. It looks as though the ceremony will have to be cancelled, as the bridge might not be safe! At first Brewster is devastated - but then he saves the day by using something Dr. Ling's been working on: her new soap was a disaster in the chugwash, as it set into rock hard foam, but it's perfect for repairing the bridge! Safety restored, Brewster proudly carries Mayor Pullman into Chuggington.

The new Mayoress, accompanied by her nephew Denzil, is touring Chuggington. She's observing the chuggers working, in order to help her decide who should be the recipient of the prestigious Chugger of the Year award. Koko is sure she's in with a chance - but rather than doing her jobs, she spends her time trying to impress the Mayoress. In the process, she ends up nearly ruining the ceremony.

The defect detector is a device that lets Vee know if there's anything wrong with chuggers as they pass by its scanners. Unfortunately, it seems to be malfunctioning! Eddie takes it off to the repair shed and Emery, wanting to be helpful, takes its place. But, worried that he might miss something, Emery sends nearly everyone to the repair shed, creating chaos in the depot! Emery feels bad that he's caused so much work for Vee and wishes he could make up for it. He has an idea. If the detector could talk, it wouldn't have to do everything through Vee. Dr Ling and Eddie think it's a great idea and they update the detector so that it speaks. And they know the perfect voice to use Emery's!

Eddie is having a very busy day and Hodge really wants to help - but all the jobs need hands not wheels. When Wilson reports the track lift is malfunctioning, Hodge decides to try to fix it himself. He only makes matters worse, bringing the lift to a grinding halt with Wilson stuck on it! Eddie agrees to let Hodge go and fetch the lift part needed, as long as he uses Dr Ling's Chugnav to guide him on his journey. Unfortunately, Action Chugger has knocked the satellite, which has skewed the signal, leaving the Chugnav talking utter nonsense! Hodge figures out that the satellite must be broken - so Action Chugger takes Hodge on an exciting trip into space to fix it. Hodge finally gets to help out!

Koko decides to try for the High Speed badge - something no trainee has ever won. Emery wishes he still earned badges like the trainees do. For fun, he plays a 'pretend badge' game with Hoot and Toot, where they award each other imaginary badges. Emery is so busy playing his game that he doesn't listen when Vee assigns him to take some supporters to the footbridge to cheer Koko on. Realising that he was so wrapped up in his pretend badge game, he forgot how important the real badge was for Koko, he takes it upon himself to be her number one cheerleader. Koko is flagging, but with Emery's encouragement, she bursts through the finish line! Emery learns that he doesn't need badges anymore - it's enough to know he's done a good job.