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On their way to a celebration for Thomas' 10,000th delivery, Percy tries to help Thomas with his big speech, but Thomas fails to listen. While distracted, Thomas doesn't notice when Percy falls off the track and gets lost. Percy tries unsuccessfully to find his way to familiar terrain.

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When Bruno comes along to help Diesel get a heavy load to the Lighthouse, Bruno tries suggesting a safer route, but Diesel doesn't wait long enough to listen to him.

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While Kana and Thomas deliver aquarium materials for the Vicarstown Fish Day, it's up to steady Percy and Nia to deliver the fish themselves.

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When Ashima is set to arrive on Sodor, Thomas and his friends attempt to go the extra mile in order to make the island seem fantastic! Thomas plans an extraordinary welcome that includes a tiger, painted dock, and big dance number. But when the spectacular plan gets ruined at every turn, the friends imperfect welcome still makes Ashima's arrival extra special.

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The engines are revved up for their homemade obstacle course event known as the Tri-and-a-half-a-lon. During practice, Nia worries that she's never been able to beat the timer, but Sandy and Carly encourage her to keep practicing before the event the next day.

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When Carly gets a new magnet to help Tess the Troublesome Crane load up a shipment of metal crates, she struggles with the new tool. Carly is frustrated that she's making mistakes during the job. Sandy and Thomas reassure Carly that she needs give herself time to be bad at it.

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After Percy gets in an accident and ends up with a broken axle, Nia temporarily takes over his mail delivery duties for him - and her mail delivery is even quicker! Percy thinks the replacement is permanent.

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Thomas and Percy are excited to deliver a special balloon for the hot-air balloon festival, but the balloon is wrapped up tight. They're instructed not to peek at it until they arrive. While making the delivery, part of the balloon pops out of its tarp and the wind carries it skyward, along with Percy.

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Carly has developed a terrible squeak, and Sandy finds an oil can to give her a feel-good surprise, but when she tries to make the fix bigger and bigger, she creates a wacky robot oil can squirter.

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After a huge storm hits the Island of Sodor, the power gets cut out. Thomas is tasked to deliver the generator to Knapford Station without getting stuck, but chooses to not get help from any of his friends.

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Thomas and Percy explore a brand-new track the evening before the route is opened. Everything seems new and exciting, and even a night spent stuck in the mud turns into a wonderful experience.

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On Sodor Clean-Up Day, the engines all head to Norramby to help pick up, but when the mysterious Stink Monster takes Percy, the engines must work together to save him.

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With the holidays just around the corner, Thomas and Percy are determined to deliver the mail to all the patrons of Sodor.

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It's Christmas time in Sodor and every engine is excitedly preparing for the holiday, especially Bruno who is excited to put his star on the tree. It's his tradition! When the Christmas tree can't be delivered, Thomas and Percy learn why traditions are important to Bruno.

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While out on a delivery to Whiff's Recycling Plant with his beloved buddy Boxy in tow, Thomas realises that his pal is on his last crooked axle.

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Ashima discovers that she has to prove to the others that she's more than meets the eye.

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When Thomas is assigned to guide Diesel and Percy on their deliveries in case of snow, he must learn that he needs to use his plow responsibly for his friends and their tasks!

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When Gordon leaves Thomas in charge for the day, Thomas sees it as his chance to prove what a good leader he is.

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When Kana wants some alone time to herself, her friends misunderstand and think that she is upset about something.

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After Thomas is sprayed by a skunk, he finds it hard to make a very important delivery to Vicarstown.

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Whiff tasks Nia with getting an Earth themed ball to Norramby Beach. But everywhere Nia goes, something is always wrong, forcing her to make drastic changes in her plan.

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Diesel is upset about constantly getting boring jobs, so Kenji offers to switch places with him for the day. But the results are disastrous!

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It's Valentine's Day and no one on Sodor is happier than Percy - he gets to deliver everyone's gifts to their friends throughout the island!

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As the other engines prepare for a Valentine's Day party, Kana is worried: she doesn't know what to bring!

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When Carly does not return from saving Emily from an accidental derailing, a worried Sandy recruits the help of a bored Diesel to find her best gal pal.

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When he accidentally causes all the lamp posts in Vicarstown to fall and shatter, an embarrassed Sir Topham Hatt requests Thomas to go on a secret mission to Harwick for replacements in time for the evening concert.

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After yet another victorious race, Kana seems unbeatable! No engine on the island is as fast as Kana! However, this does not stop Sandy from challenging the electric engine. Everyone is sure Kana will win again. Sandy picks the route for the race, using her smarts and her small stature to her advantage!

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When a precious marble statue of his great-grandfather arrives, Sir Topham Hatt enlists the help of Thomas and Bruno in delivering it to Vicarstown Plaza. During their journey, Thomas disregards Bruno's suggestions by doing what he thinks is best -- but his actions cause the statue's top hat to begin to crack!

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When Salty the Diesel Engine returns from his worldly travels, he sings a shanty to Thomas and Percy about a legendary treasure lost on the Island of Sodor. The two friends are eager to see if the legend is true, but their journey comes to a snag when the rest of the Biggest Adventure Club refuses to join.

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On a particularly blustery Balloon Festival day, Thomas is tasked with retrieving any balloons that start to drift away. When the Kraken-shaped balloon soars off, the chase is on!

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Thomas learns that the rocket he helped deliver is finally falling back to Earth, into the ocean outside Sodor. Bulstrode, Carly, and their team of retrieval experts are on the job to fish the rocket out of the water, and Thomas wants to help!

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After Sir Topham Hatt messes up his instructions for Kenji's passenger delivery, Thomas is asked to set things right! However, as Thomas follows Kenji's trail, he repeatedly forgets to ask his friends for specific directions, preventing him from catching up to the speedy electric engine. Realizing he has to pay more attention to details, Thomas uses his wits, listening skills, and the help of his friends to make it to Kenji and get the passengers to their destinations on time.

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A rough night's sleep and a cancelled beach day puts Thomas in the grumpiest of moods. Encountering Riff and Jiff with their usual happy-go-lucky attitudes, Thomas comes to the conclusion that he'll only be liked when he appears happy. He puts on a fake smile for the rest of the day, but his words don't match his demeanor and everyone can see right through him. Finally, Thomas comes across Riff and Jiff again, who reveal they're also upset about the cruddy day!

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Thomas gets help from Terence the Tractor and Carly to assemble all hay bales. Carly and Terence manage to get everything together quickly, but soon Terence purposefully crashes into the hay bales sending loose hay all over the place! Carly is shocked and confused. They turn the hay-bale stacking into a game, forming all kinds of structures Terence can crash into. Thomas worries they won't have enough time to complete the delivery.

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After Gordon tells all the young engines that they have a day off to relax, Thomas and Diesel insist on a teamed relay race through the obstacle course. Percy is the only one who isn't interested in playing, so Thomas asks him to referee instead. He reluctantly agrees and the race is on! Coming to a split-second finish, Percy determines Thomas' team wins, but Diesel doesn't accept and calls for a rematch. Once again the teams race and Diesel wins after accidentally causing an oil spill. Both teams become so angry with each other, they're too distracted when Percy runs off to chase butterflies. Thomas, Diesel, and friends finally notice Percy's absence and speed after him, but they'll need to learn their lesson about sportsmanship if they want to ensure this day off is a success.

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When Thomas and Percy must transport an unlucky boxcar of bananas, Thomas seems to have bad luck. Percy's positive attitude helps Thomas see the luck in each scenario, breaking the myth of the curse for a successful delivery.

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Nia is nervous about working with Tess, the fastest -- and bossiest -- crane on Sodor! When Nia's plan for a safe and speedy delivery goes awry and causes Tess' wheels to clog with sand, they recruit handy Sandy to solve their problem. Luckily, Sandy has a new invention to get Tess up and going again: a tanker full of her Super-Slick Easy-Greasy Crane Grease! However, chaos continues to ensue when Nia gets stuck in the mud and the runaway grease spills all over Sodor! In the midst of the madness, Nia learns how to fix her original plan and save Sodor from slipping and sliding!

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It is a special day for Harold -- the Northern Lights will shimmer over Sodor at sunset! He cannot wait to share this moment with his engine friends on Lookout Mountain. However, Thomas and the gang have a busy day ahead of them, which is impacted by damage to the Sodor Suspension Bridge. Carly and Sandy warn the excited engines that they should only cross the bridge in case of an emergency -- a rule that is ignored by Kana, Diesel, Nia, AND Thomas! When the bridge finally collapses and prevents them from reaching Lookout Mountain in time, Harold selflessly chooses to help his friends instead of see the Lights. His sacrifice teaches the young engines an important lesson: your actions add up - stay away until it is safe to play.

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Bruno is beyond delighted -- he has received the gift of an updated map of Sodor from Sir Topham Hatt! He and Thomas can't wait to use it to navigate their busy schedule for the day. But when Kana's speedy whoosh blows Bruno's beloved map up, up, and away, Thomas and Bruno team up with Percy and Diesel to recover it! While searching the island far and wide for Bruno's prized possession, the gang discovers that there is something more important than keeping their schedules -- their friendship!

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After a near-collision rattles their wheels, Percy and Kana enlist the help of Emily to introduce new safety measures all over Sodor. However, their anxiousness about accidents push Percy and Kana to ridiculous extremes that only makes more trouble! When Percy has another accident caused by his off-the-rails safety obsession, he refuses to leave Tidmouth Sheds. When he has to leap into action to help his friends, Percy learns that paying attention to your surroundings is the best way to not have an accident.

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When Bulstrode excitedly announces that he is getting a brand new paint job on the Mainland, everyone is thrilled for him -- except for a crankier-than-usual Cranky. When the crane's dismissive comments upset Bulstrode, the tugboat storms off, leaving Thomas and Percy to pick up the pieces, repair their friendship, and encourage both of them to do something they have never done before -- talk about their true feelings towards each other!

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Gordon has a day-long assignment for Thomas and the Troublesome Trucks -- they have to transport delivery after delivery to Vicarstown! The Troublesome Trucks are less than enthused -- this "sameroo" job will bore them out of their bolts! The Number One Engine is determined to make the day "amazeroo" for them and does his best to turn their repeated route into a new adventure! After their game of "Switcheroo" gets them lost, Thomas and the Troublesome Trucks learn that routine is not necessarily a bad thing -- in fact, it can be very helpful!

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When Percy is accidentally doused in blue paint, he gets the opportunity to be Thomas for a day.

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They get a Super Axle.

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When an important shipment is delayed, Bruno and the gang have to learn the great value of waiting patiently.

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When water lines break all over Sodor, the engines chug into action to deliver repair parts. But engines are not what this problem needs, it needs off-track thinking and the help of Skiff and Terence.

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Thomas has been playing hard with Boxy, certain that his beloved friend/co-worker/toy will last forever. But when Thomas' careless behaviour leads to Boxy's being broken beyond repair, Thomas must confront his own behaviour.

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It's a beautiful summer day on Sodor and Sir Topham Hatt has a surprise: a special plaque with a map of the island atop Lookout Mountain! Sir Topham Hatt recruits the engines to lead "The Sight of Sodor" tour: to the plaque and back, missing all of the real tourist attractions! The engines are not enthusiastic about Sir Topham Hatt's attraction -- and neither are the island's visitors! As less and less passengers board Annie and Clarabel to see the plaque, Thomas and the gang decide to take matters into their own wheels and show off their favorite places on Sodor -- resulting in a lot more fun in the sun!