In a reboot of the classic TV series, a younger Thomas The Tank Engine goes on adventures with all of his friends, as they work on the Island of Sodor.
Gordon's coupler is damaged while pulling a long line of recycling cars to the Recycling Plant, Thomas and Diesel both pull the train in a contest. Thomas gave up winning the contest to keep his promise to Gordon.
It's rocket launch day and all the trains get to help deliver the big rocket parts, but when Thomas is assigned a tiny part, he puts it off to help the others with their more exciting parts.
When Percy has to deliver a new light bulb to the lighthouse at night, Thomas suggests playing secret agents along the way to help Percy forget about his fear of the dark.
When Thomas builds an obstacle course for his friends, he gets upset when they won't play with it his way.
Thomas volunteers to get Annie and Clarabel across Sodor without waking them up, only to discover that it's going to be harder than he imagined.
When Kana's power goes out during a delivery run, Thomas teaches her that sometimes it's okay to go slow.
It's Thomas's job to deliver a giant wooden dragon at the Medieval Faire at Kirk Ronan. The other engines want a turn, so they all compete to catch the dragon, pretending to be knights, thinking whoever catches it will get to deliver it.
When Thomas finds a treasure map, he creates The Big Adventure Club to seek the treasure. Sandy wants to join but Thomas says she's too little, so Sandy forms her own club.
When Thomas borrows Percy's lucky bell for a dangerous delivery, Thomas accidentally loses the bell.
When Sandy learns about a massive shipment of sand that needs to be delivered, she is determined to help despite her size.
When the trains must deliver in pairs, Thomas is disappointed to be paired with Diesel instead of his BFF Percy.
Thomas and Percy volunteer to deliver a herd of cows, but the cows keep wandering off on their own adventures.
When music-lover Nia gets stranded before a big concert she's been waiting to see, Thomas brings the concert to her.
Thomas misunderstands the Backwards Day game and accidentally delivers the wrong cargo to the wrong places.
Thomas and Kana get muddy while playing in the rain. When the rain suddenly stops and discloses a rainbow, an excited Thomas and Kana race to find the end of the rainbow.
When a parade balloon Nia is set to deliver flies away, Thomas helps Nia adjust her plans to get it back.
When Percy loses Nia's parade flag before the big parade, Thomas helps them search for it before the event begins.
Kana is upset when she keeps running out of power, but a mystery scavenger hunt is just the thing to cheer her up.
Thomas pretends to be a hero to help ensure the movie screen Nia's delivering arrives clean and pristine.
Percy feels anxious about spending a night away from home during an overnight delivery with Thomas and Nia.
When Thomas and Percy's plan to surprise Diesel goes awry, the two friends still manage to cheer up Diesel... just not in the way they expected.
When Thomas helps Nia make a delivery to the beach in Norramby, he insists he knows a shortcut and leads the way. It turns out, however, his memory isn't as good as he thought.
When all the trains but Thomas get deliveries, he's left to spend the day alone. With the help of an old boxcar and a battered beachball, however, an adventure unfolds.
When Thomas' No.1 gets covered by paint, Diesel's comment about Thomas not being number one any more causes him to doubt himself.
The engines look forward to the roller-coaster at the Vicarstown Carnival, all except for Percy, that is, who's a bit afraid.
Thomas is so excited to show Annie and Clarabel's passengers the scenic views of Sodor, but then the power goes out all over the island.
When Yong Bao visits Sodor, a jealous Thomas sets out to prove he's the braver train and challenges Yong Bao to a series of bravery challenges, only to have his plan backfire as the two end up trapped in the Old Mine.
Thomas and Percy think they're great communicators, but when they're tasked with delivering a submarine to Vicarstown, communication becomes a bit more difficult… to say the least!
Thomas and Percy have a difficult delivery, they must take eggs and other cake ingredients safely to Vicarstown for their bake-off.
When the engines are delivering attractions to the annual Harwick Beach Carnival, a series of mistakes causes the precious Calliope to break; luckily, the engines come up with a creative solution.
Thomas and the other engines are enlisted to deliver some newly discovered dinosaur bones, but they must deliver them in the correct order for assembly, which isn't as easy as it sounds.
When Gordon is unable to make an important delivery on his own, Thomas offers his help, but Gordon insists on second-guessing Thomas's every move.
When Thomas accidentally breaks a light he's hauling to the Sodor Festival of Lights, he learns the best way to be the No. 1 engine is to be honest after making a mistake.
Thomas needs repainting and must be patient as he dries, even though he feels like he's missing out.
Nia shows Thomas and Diesel how much unique beauty exists in Sodor, which comes in handy when they need plants to beautify a Plaza in Vicarstown.
When Thomas's whistle suddenly stops working, he learns that he doesn't need his whistle to still be himself.
When Thomas and Percy get into their first big fight they're afraid that their friendship is over... until Nia helps them figure out how to resolve it.
Nia has volunteered for a big day of deliveries and is determined to make the perfect plan to get it done, but when things start to go awry, she doggedly sticks to her plan and refuses any help.
On the last day of Yong Bao's visit to Sodor, his friends dig up a giant keepsake to help him remember them.
When a big storm approaches, Thomas and company must complete a week's worth of deliveries by the end of the workday, but when Sandy needs repairs, Thomas and the gang realise just how important Sandy is to the team.
While the trains are setting up for the Vicarstown Fall Festival, Thomas is feeling down about the end of summer and the changing weather.
Thomas rolls along to help Percy face his fears when he must deliver the mail on Halloween, when everyone knows the legendary Ghost Train appears.
When Thomas throws away Diesel's favourite oil can thinking it's trash, he makes a promise to get it back and, in the process, learns it's better not to touch things that aren't yours.
While playing hide and seek with Percy, Diesel accidentally gets stranded on a barge that floats out to sea.
Thomas and Diesel take a friendly competition too far and put an important delivery rescue at risk as they race across Sodor.
Percy announces he's giving up his Ghost Scaring Machine as he's too old for it now. It soon becomes clear that the machine is good for more than just scaring ghosts.
Thomas is elated when he finds a cowbell on the side of the tracks, until his friends start hogging it.
When Sir Topham Hatt's Hat blows away in the wind before making an important announcement, Thomas and his friends race around Sodor, trying to catch it. The Hat remains out of reach until they learn to work together.
Nia is planning a big party to celebrate the anniversary of her arrival on Sodor, but she finds that her friends don't remember her anniversary and are too busy to even talk about it.
When Thomas spends the day carrying rockstar idol Harold across Sodor, he gains a new perspective on just how amazing it is to be his engine-self.
