When Gordon's coupler breaks, Thomas promises to deliver his cars to Whiff's Recycling Plant, but will Thomas be able to fulfill his promise or will his contest with Diesel distract him?
Thomas and his friends are asked to deliver pieces of a space rocket to Brendam Docks. Thomas is disappointed when the only piece left for him to take is a little battery, so he tries to help his friends with their larger 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.
Thomas forms a Big Adventure Club with Percy and Carly and they all think Sandy is too little to join them in the search for the legendary Crystal Locomotive.
Thomas, Percy and Nia have to make a delivery to Wayland on the Mainland. As the the trip will take a couple of days, they have to camp out in the woods overnight, but Percy is anxious.
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.
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.
When the engines are delivering attractions to the annual Norramby Beach Carnival, a series of mistakes causes the precious calliope to break. Luckily, the engines come up with a creative solution.
The engines are asked to transport a complete dinosaur skeleton to Vicarstown and it's very important they keep the bones in the right order for the paleontologist.
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.
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.
When a big storm approaches, Thomas and company must complete all a week's worth of deliveries by the end-of-the-workday whistle, but when Sandy needs repairs, Thomas and the gang realize just how important Sandy is to the team.
When Thomas throws away Diesel's favorite oil can thinking it's trash, he makes a promise to get it back and learns it's better not to touch things that aren't yours.
Percy has to deliver the mail on Halloween when everyone knows the legendary Ghost Train comes out. Thomas rolls along to help Percy face his fears, but when a "real" Ghost Train appears - things get almost spooky.
While playing hide and seek with Percy, Diesel accidentally gets stranded on a barge that floats out to sea, where it becomes a group effort to rescue him.
Thomas finds a cowbell but when he shares with the other engines, they do not stop playing with it and lose it Then Thomas finds someone who needs it more.
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.
