After the engines decide to show their best-selves by staying clean and sparkling for the Tidmouth Sheds open house, they are confronted by a sinkhole ruining the tracks.

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

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

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

Bruno and the engines team up to complete an urgent delivery in windy weather.

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.

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.

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.

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.

Percy has been hiding an oil leak, afraid of what it means to get it fixed. When it starts to interfere with his deliveries, Percy needs Thomas and his other friends to help him.

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

They get a Super Axle.

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.

Winston, Sir Topham Hatt's new track car, causes problems by not seeking assistance.

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.

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.

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!

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!

Thomas and the friends build an express track for Kana to speed fast enough and turn her electric crackle a bright red. However, the engines discover a duck pond in the path.

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.

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!

Thomas and Ashima spend the day helping Nia try to make her new Indian plant thrive in its new environment.

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.

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!

Sandy and Diesel decide to do a magic act: "Disappearing Sandy". But when the trick works a little too well, Diesel sets out to search for his friend.