The adventures of Thomas the Tank Engine and his friends on the island of Sodor. Thomas is often in trouble and finds it difficult to be a useful engine.
The Fat Controller asks Sidney to collect Percy's new wheels but Sidney worries he might forget as his memory isn't very good. Thomas suggests making up a song for Sidney to remember.
Bradford the Brake Van arrives in Sodor and is a stickler for the rules. Thomas decides to go off without him and gets into trouble.
Daisy gets a good-natured new goods engine named Ryan to help her out with some of her passenger duties.
CGI animation. During a storm, Skiff the tiny railboat gets blown down the track and right into a tree that lightning has been brought down across the branch line.
CGI animation. Daisy decides that her new passengers are too special for her to pick up children with ice lollies or pull a dusty baggage truck.
Thomas is irritated by dumper trucks Max and Monty's careless antics.
Connor breaks a coupling rod and, after repairs, goes from the fastest engine on Sodor to the slowest with his newfound caution.
A very hot day on Sodor causes the tracks on Thomas' branch line to buckle and a change of hat for the Fat Controller.
When Duck's whistle begins to make funny noises, the other engines make fun of him and Mike gets so angry that he blows his safety valve.
Henry is very excited as it is time for him to be repainted. But the Steamworks is very busy, and Kevin grabs some cans of luminous paint by mistake for Henry's paint job.
When a zeppelin comes flying over Sodor, Hugo is convinced that he is meant to fly too. But try as he might, he can't get off the ground.
Ryan takes Judy and Jerome to Arlesburgh Harbour for a change, but when Thomas goes looking for the breakdown train, it is nowhere to be found!
When Skiff overhears Sir Topham Hatt talking about a mermaid at Sodor's maritime museum, Skiff goes out to sea with Sir Topham Hatt and gets into trouble.
While Marion is working on Thomas' Branch Line, she hears a strange voice and thinks she has found a talking Christmas tree, but no one believes her.
Stephen, the old engine at the castle, is jealous when Glynn, the old coffeepot engine, is restored and brought to Ulfstead Castle.