An invitation from the Queen sends Thomas and the Fat Controller heading for London, but the journey is anything but straightforward and Thomas meets a very special engine called Duchess along the way.

Thomas befriends a stray dog who is wandering around the railway and tries to find him a home. In the process, Thomas derails and the fuzzy little dog raises the alarm.

A little railway show comes to Sodor and a misunderstanding leads to all the small engines on railway turning up at Ulfstead Castle to participate.

In Brazil, Thomas meets two wood-burning engines who've never travelled beyond their eucalyptus railway. Thomas agrees to swap jobs with them for the day, but this causes more trouble than he expects.

When a Pretend Emergency turns into a Real Emergency, there's only one engine who can save the day.

Nia has her work cut out when she is asked to transport an elephant who doesn't like steam engines to the Animal Park.

Thomas pushes Shankar into entering the Fancy Costume Contest even though Shankar doesn't want the spotlight on him.

James is inspired to become the world's first "super engine".

It's Friday the 13th in Italy and Thomas tries to improve his luck by following Lorenzo and Beppe's advice on superstitions.

Thomas helps his friend Ace overcome his fear of animals so that he can compete in the Super Stunt Rally.

Sonny is trying to prove himself to be a useful engine so that he can stay working on Sodor, but nobody seems to trust him - nobody apart from Diesel, that is. But can Diesel be trusted?

Thomas helps Ruth fix up an old windmill into her new, energy-efficient workshop.

When the Rickety Old Bridge collapses, trapping Toby and Henrietta on the other side of the ravine, Inventor Ruth is asked to build a new one.

Yong Bao tells Thomas the story of how he cleverly diverted an accident, saving hundreds of passengers and was decorated for his bravery with a tiger emblem on his tender and a bright red coat of paint.

Gordon tries to tell Rebecca how to pull the express like he does, but Rebecca proves that her way may not always be as loud or fast, but works just as well.

In an attempt to beat Thomas in a race, Cleo decides to use the railway lines instead of the road. She soon learns that the roads are much safer for a little car.

Nia uses what she learns about lighthouses to suggest covering a big wheel in Christmas lights, so that Harold can see where he's going in a storm.

Cleo is shocked to learn snow does not last forever and tries to stop it from melting.

Thomas is asked to dress up as a monkey for a special event at the Animal Park, but all the other engines laugh at him. Luckily, Rebecca is on hand to offer some useful advice.

With a technology fair on Sodor, Thomas and the Steam Team tackle a flurry of tasks but can they complete their deliveries before the grand opening?

Emily worries she doesn't have a best friend but, when the other engines help her out of a tricky situation, she realises she's been surrounded by best friends all along.