When the big engines refuse to come out of the shed, Sir Topham Hatt buys a little tank engine called Percy. Not long after, Percy gets a fright on the main line.
Marion the steam-shovel gets a big surprise when she sees some dinosaurs late one night. The next time she sees them, they chase poor Marion all the way to Ulfstead Castle where the mystery is revealed.
When Emily first arrives on Sodor, she takes Thomas' coaches by mistake and rescues Oliver. Then, when Sir Topham Hatt is ill, Emily helps Dowager Hatt to run the railway.
Toad the Brakevan spots a beached whale, but no-one believes him. Finally, Thomas believes him and Toad comes up with an idea to save the stranded whale.
When Sir Topham Hatt goes on holiday, he meets a tram engine called Toby with a coach named Henrietta who he brings to work on Sodor. Then, Toby saves the day up at Ulfstead Castle when two thieves try to steal King Godred's crown.
When James first comes to Sodor, he has a bad accident with the Troublesome Trucks. Then, James tricks Thomas into giving him Gordon's express coaches so that he can steal an important job.
Annie and Clarabel are always complaining about Thomas going too fast, but when they are mistakenly coupled to Caitlin the stream-lined engine's train, they realize what "fast" really means.
Thomas spots a vintage plane overhead and is amazed to hear about their heroic actions during the second world war. Thomas desperately wants to be hero, too.
Percy is taking two Troublesome Trucks full of pumpkins to a festival, but the trucks play a trick on Percy and uncouple themselves. Thomas and Percy set off in search of the trucks and their important pumpkins.
Thomas gets some help from a Fairy God Engine on the day of the Earl's fancy-dress ball, but he forgets the time and the magic spell wears off at midnight. The Earl sets out to find the engine whose funnel fits a feathered necklace.
The boiler at the Animal Park has broken down and the animal residents are in urgent need of warmth. Thomas tries to find them a temporary new home until the new boiler can be delivered.
Thomas comes to the rescue during a forest fire in Australia, Luke befriends a deer at the Blue Mountain Quarry and Thomas meets some naughty monkeys in India.
Features the story of Diesel's first day on Sodor, the time Sidney sang a song to help him remember his special job and when rough and tough Diesel befriended some fluffy little ducklings.
Thomas is given a surprise birthday party, then he is scared at the prospect of pulling a real dragon in China and then Thomas gets his wish granted by a Fairy God Engine in time for the Earl's fancy-dress costume ball.
