'Arry & Bert, the naughty diesels, take advantage of the fact that it's Halloween and when Thomas and Emily are sent to do important work at the Smelter, the two diesels decide to give the steamers a fright or two!

Edward is chosen to compete against Spencer in a race, but is soon left eating Spencer's dust due to his much larger amount of power. Far out in the lead, Spencer grows overconfident and decides to have a little snooze...

Gordon is scared that he'll be scrapped due to strange noises inside him that he's making. Will he inform about his problems or will he instead try to hide them?

Some of the diesels receive a dose of contaminated fuel but will Thomas help fix the situation after Diesel calling him a "stinky old steam engine"?

While a new station is being built, Thomas has to go around a sharp bend though Annie and Clarabel help him. But when they are sent to the works, will Thomas find the courage to go around the bend, or allow the Troublesome Trucks to cause havoc?

Gordon shows off to Percy while teaching him how to pull passengers. In doing so, Gordon doesn't notice a dangerous icy section of line...

James' new lick of paint makes him concentrate less on his work, but when he's given a very dirty job to do later on, he soon shifts his way of thinking...

Thomas wishes he could collect the fireworks stock to deliver to the Harvest Fireworks Display but feels most disappointed when James is chosen to do the job instead. James, however, breaks down...

When the other engines ask James for help with some hard jobs, he says he's much too busy with his assigned task of exporting loads of coal around the Island. However, when James breaks down, his attitude soon changes...

Thomas is hasty and decides to haul all the trucks with loads of fish he has to deliver all at once. He soon finds that in doing so, they are too heavy to pull in one shot...

Emily is chosen to do the route running through Black Loch, but on her first run, she sees spooky shapes in the water which appear to be sea monsters!

When Gordon becomes stuck on the Hill, Toby comes to help and push but will he have enough confidence in himself after Gordon saying earlier on to him that he's not a proper engine?

Following some time being overworked and running late, Percy overhears the Fat Controller talking about sending him to the scrap yard! Two accidents later, this makes him wonder whether he will be sacrificed to the flame...

Percy's loud whistle blowing to show that he can make as loud a sound as 'Arry & Bert's horns distracts some of the others and is told by the Fat Controller to only whistle at appropriate times. However, Percy isn't sure to whistle to warn Thomas from crashing some time later. Will he let his friend crash or will he make the right decision by blowing a warning whistle?

Thomas and Percy's efforts to be the cleanest engines on Sodor for the Cleanest Engine competition are continuously thwarted. Will luck come to them?

Thomas is to collect the Brass Band to take them to the park as a treat for Lady Hatt's birthday but when he does is in such a hurry that he leaves the Tuba Player standing on the platform. Will the Fat Controller's party plans for his wife be tarnished?

Emily has to stand in as the puller of Gordon's Express, and is determined to pull it as fast as him, but ultimately fails. Luck, however, soon greets her...

Emily offers to help Thomas with his loads, but Thomas refuses any help whatsoever his friend has to offer, or at least at first.

Emily's bossy attitude is really getting to Thomas. So when a large snowfall arrives, Thomas decides to ignore her advice about wearing a snowplough, forgetting past incidents...

The engines are hiding a big secret from their blue tank engine friend, but what could it possibly be?

Percy collects a special carpet to deliver, but suddenly the windy weather starts to blow it around. Percy, though, thinks that it's a magic flying carpet!

Thomas feels sad when he has to deliver ingredients to the Ice Cream Factory instead of taking children to the beach, but later feels much happier thanks to a nice little surprise...

Thomas stubbornly insists on pulling the entire Circus Train by himself, but soon finds it too heavy to pull on his own.

Emily finds that being unkind to others is the wrong thing to do when in need of help with a big job.

Henry wishes he could pull passenger trains like Gordon instead of log trucks. However, Henry comes upon a Wishing Tree which Sodor's children regulary visit later on that day...