Thomas & Friends series 21

Daisy's springs need fixing after Diesel bumps her. Diesel notices this when Ryan was taking her, Judy and Jerome to the Dieselworks, after he bumps Thomas at the yards and gets annoyed with everyone talking about it. After Daisy is repaired, she tells Diesel that he needs to change his ways.

Diesel causes trouble between Daisy and Harvey by spreading rumours, but some crates at the crossing make Daisy and Harvey be friends, by assisting one another on a task.

Dowager Hatt runs the railway, while Sir Topham Hatt is sick and away, but causes lots of trouble, starting from Thomas collecting her new hat to Emily taking Annie and Clarabel on Thomas' Branch Line to Gordon taking trucks of scrap to Percy taking Gordon's Express and other things causing confusion and delay. This gives Emily the time to help her.

Harvey is a cheery engine, not only unique for his paintwork but for his crane, but when a branch gets stuck in the gears of his crane while clearing some branches out of the way, Harvey feels too shy to ask for help, resulting in trying to fix it himself, only to derail outside a tunnel.

After a mess with the garbage, Stephen thinks that Millie ran away after hurting her feelings, so he leaves Glynn at the castle to find Millie with his passengers unexpectedly with him, only to run out of water.

Sir Topham Hatt's new public address system causes havoc, while Reg uses the old public address system for music down at the Scrapyard.

Whilst Henrietta is at the Steamworks being refurbished with new seats, Toby works with another coach, that looks just like Henrietta, who is named Hannah. Hannah is excited to be working with Toby and criticizes him for being slow. She makes Toby speed up too much, so Toby leaves Hannah on a siding and when he returns, Hannah is nowhere to be seen. James passes by with Hannah in tow. At first Hannah is enjoying her fast ride but when she starts to fall apart she becomes horrified as her coupling snaps and as she heads into a nearby siding, now knowing that going too fast can be dangerous. Later on, as Toby arrives with Henrietta, Hannah is happy to see Toby, but when she notices Henrietta, to Toby's surprise, Henrietta reveals that she and Hannah are sisters.

After some trouble down at Brendam Docks, Cranky thinks that the Fat Controller will replace him with a newer, shinier crane.

Cranky competes against Carly the new crane when she starts taking all his work, only to get her and himself tied up.

• This episode marks the formal introduction of Big Mickey, a hitherto-silent character from the franchise's sister series TUGS, whose model had previously been used as set dressing following the cancellation of "TUGS".

When Bertie the Bus breaks down at the Level Crossing during yet another race, Thomas starts making unscheduled stops for Bertie's passengers, which in turn delays his own other passengers. The Fat Controller becomes suspicious, so he decides to follow Thomas and finds out about his unscheduled stops, so he recruits a newly resurrected Bulgy (who returns since having a cameo in Series 12) to fill in for Bertie as well as take his passengers, which means Thomas can run on time again.

Philip wants to know why he has the number 68 painted on his side after being teased about it by Gordon. For a while, Philip thinks of numbers of where ever he goes, from the Steamworks to the Dieselworks and from the Station platforms to the Troublesome Trucks, until he saves Farmer McColl's sheep from Gordon: 68 of them.

When Rosie is repainted red, according to Thomas, James becomes jealous and challenges her to a race to Crovan's Gate to see who is the "Fastest Red Engine on Sodor". Following a near miss with Henry, James is advised by Rosie to have his brakes checked. Unbeknownst to James and his crew, however, he is leaking brake fluid, but they haven't heard the noise since James gave Rosie his Troublesome Trucks. This results in a total brake failure, and James crashes into the back of Tidmouth Sheds.

While the damaged part of Tidmouth Sheds is being repaired, Edward first sleeps at Wellsworth Sheds with Philip, then at Brendam Docks, then at the Steamworks, then on a ship, then at Ulstead Mine, and then the woods, but they are all too noisy for him to get a good night's sleep all night long or all day long.

When a big freeze hits the island of Sodor, Diesel finally proves himself to be a hero by bringing the coal for the steam engines.

Emily must help Donald and Douglas with a long, heavy train of pipes to Vicarstown. Donald pulls at the front, while Emily and Douglas push from the back. On the way, Douglas tells Emily about Donald's accidents, making Emily laugh. Her laugh echoes through the pipes, causing Donald to hear and want to switch places with Douglas. As they go up Gordon's hill, Donald tells Emily about Douglas' most recent accident, which makes Emily laugh again. Douglas overhears this and argues with Donald. Emily is unable to hold the train on her own, and as a result, she gets pushed off the rails by a giant snowball.

Terence takes a shortcut across a frozen lake while collecting Christmas trees for the holiday market and Thomas tries to save him.

• The flashback events of Thomas, Terence and the Snow/Terence the Tractor were recreated. Unlike the original story where Terence pulled Annie and Clarabel first when they were uncoupled from Thomas, he pulls them all out at the same time in the flashback.

Daisy is sad when Christmas doesn't go as planned: the Decorating of Vicarstown, the Children, Mike, Rex, and Bert's fake snow show, the electricity problem back at Vicarstown, the Troublesome Trucks singing Christmas Carols, and Harold with the Star. Ryan, Judy and Jerome soon tell her that change is good every year.

Spencer and Gordon accidentally upset their passengers when their competitive behavior gets out of hand and their coaches get mixed up before the New Year's celebration begins.