Duncan, the grumpiest engine on the narrow gauge railway, gets a taste of his own medicine when he receives a very grumpy passenger.

It's Christmas Eve and a lot of passengers are coming home to Sodor for the holidays. Connor can't carry all the passengers who are trying to get on his train.

Everyone is happy at Christmas time except for Duncan, the Scottish narrow gauge engine, who seems to be grumbling even more than usual.

When Thomas and Diesel are sent to collect trucks from Farquhar Quarry, they argue about who should be the back engine.

Gordon is always teasing Edward for being old and unreliable and never thanks him for helping him up the hill. One day, Thomas decides to play a trick on Gordon to give Edward the respect he deserves.

Annie and Clarabel are always complaining about Thomas' speed, until one day they are accidentally coupled to Caitlin. Can Thomas stop high-speed Caitlin before she takes his carriages to the Mainland?

Thomas is on his branch line when a passenger pulls the emergency cable and he has to stop quickly. However, it turns out not to be an emergency at all, but a bird watcher who has spotted a rare bird.

It is a slow day for Gator when he finds himself sitting around with nothing to do. However when Oliver breaks down, Gator is more than happy to help.

Toad is bored of listening to Oliver's stories and wants an adventure of his own. He gets his wish when some trucks break away on Gordon's Hill. Can Toad stop the trucks before they collide with Thomas?

It is high summer, when many tourists visit Sodor and The Fat Controller is concerned about getting them all to their destinations on time. Duck tells the other engines about the slip coaches they used on the Great Western Railway that can be uncoupled at stations without stopping. James then tells the Fat Controller and claims it as his idea. But James has never used slip coaches before and soon runs into trouble!

James needs to rescue Duck from a flood. James collects Rocky, but doesn't wait for the crane's arm to be secured. Rocky's arm knocks over a signal which leads to all sorts of trouble.

Bill and Ben run out of coal during a shortage at Clay Pits and have to rely on Timothy, who runs on oil, to help them out.

Marion thinks she saw dinosaurs in the middle of the night, but passes it off as a dream. She then gets a real shock when they seem to be real.

Percy misses his friend Gator and ends up rushing around as he tries to keep his mind occupied. He is so busy that he loses control of some trucks, which roll into an old mine.

Spencer brings a VIP back from the mainland, but is so intent on doing a good job that he does not notice that he has been sent down the wrong track.

Gator returns to the Island of Sodor after being away for a long time. He is looking forward to seeing his old friend Percy.

Marion uncovers what she thinks is the mast of a Viking ship while doing some repairs on an embankment. Thomas suspects that she may have hit a water pipe, but Marion is not so sure.

Bill & Ben trick Timothy into going on an island-wide search for a multi-colored truck. But when the oil-burning engine realizes he's been duped, Salty helps him find a clever way of making the twins trickery come back to bite them. Also known as "Timothy and the Rainbow Car".

Diesel gets all the other diesels to hide from Paxton who thinks they've all disappeared. Diesel gets carried away and takes the joke a bit too far, but despite this, Paxton still helps him when he runs out of fuel.

The whole island is celebrating Christmas and there are decorations everywhere. But it doesn't look very Christmassy at the scrap yard. Percy starts to worry that Reg is missing out and he tries to find something to give Reg to cheer him up.

Emily has to take a giant globe to the animal park.

After losing his way on his first day, new engine Samson has become a laughing stock amongst the engines. The strong little tank engine is determined to get through his day without making any mistakes, but has no such luck.

After hearing an eerie noise at the docks, Salty tells Thomas that it's the "Flatbeds of Fear" looking for an engine to couple up to. The word spreads and soon Henry and Emily hear the spooky noise and are running scared.

When Scruff breaks down, Samson is sent to help Harvey collect scrap from the lineside, but Samson takes his instructions a little too literally.

When Millie is startled by the head of a model dinosaur, Samson makes fun of her and the French narrow gauge engine is determined to get her own back.