One winter's evening, Henry is excited to be given the chance to pull the fish train that the men call, "The Flying Kipper". Unfortunately, snow and ice result in an accident. The Fat Controller decides to send Henry off to the Works at Crewe, where Henry will unknowingly be given more than just a repair job...

Some boys fiddle with James's controls and he trundles off down the line by himself. It is up to Edward to catch up with James and allow James's fireman to jump aboard the runaway engine to stop him.

Percy is ill of the bigger engines around ordering him about. The Fat Controller releases him to work at his new Harbour, and also brings in a new engine called Montague, but who prefers the name of "Duck". The big engines try and order Duck around as well, but Duck won't stand for it and together with Percy, he puts them in their place.

Diesel is still angry at Duck, and plans his revenge. He tells the trucks jokes about Gordon, James and Henry, and says Duck told them to him. The trucks start gossiping, and soon enough the big engines find out...

Duck has been sent to work with Edward for a while, and tells Edward that the Fat Controller and the other engines all hate him. Edward says they don't, and asks Duck if he would like to help him work. Duck helps Edward pull a heavy goods train up Gordon's Hill, but the trucks break away and speed down the line. Duck manages to control them but a barber's shop is up ahead...

Donald & Douglas have arrived from Scotland to help the Fat Controller - but have caused great confusion in that only one engine was expected! Despite all, they try their best but a spiteful brake van causes trouble between them.

Since the arrival of Boco, Gordon is upset when the Fat Controller allows branch line diesels to pull main line trains. Edward suggests that he should run on the branch for a change. Gordon thinks such an idea "vulgar", but little does he know that a run on the branch is quite unexpectedly in store that night...

Percy tells Thomas and Toby a story about a ghost train. Thomas doesn't believe it and says Percy is a "silly little engine". Percy's Driver later tells him it wasn't true, it was on television. Later that night, Percy is on his way back from the Harbour when he crashes into a lime cart trapped on a crossing. Now white as a sheet, and with help from Toby, Percy heads off to find and scare Thomas...

Duck and Percy are exhausted with the extra work in the harbour so the Fat Controller sends for another engine to help them. What a shock they receive when it turns out to be Diesel!

Henry's favourite place on Sodor is the forest; he loves the trees, the animals and the peaceful nature sounds. He is heartbroken when storms damage the trees and the broken timber gets cut up and turned into furniture. Luckily, help is at hand...

Emily is a new steam engine who has recently arrived on the Island of Sodor. She accidentally takes Annie and Clarabel, and Thomas gets annoyed by this. Later, Oliver & Toad get stuck and Thomas is fast approaching! Emily, who is closeby, sees this and rushes to the rescue, but will she prevent a possible serious accident from occuring in time?

The Fat Controller gives Ferdinand the honour of helping Gordon take the Lion of Sodor to the summerhouse. Gordon, however, gets very jealous, which causes a nasty accident on the track.

Henry the Green Engine doesn't like getting his paint wet - so refuses to come out of the tunnel. The Fat Controller tries everything, including getting Thomas to push Henry out but the big green engine still does not move. In the end, the Fat Controller orders a brick wall be built to block the tunnel entrance, meaning Henry stays in the tunnel forever...

Thomas is in the yard shunting when new engine James rushes past with a goods train yelling for help. James has wooden brakes and the trucks are pushing him down the line. The alarm goes - James has crashed into a field of cows. Thomas has to get the Breakdown Train and help James. Afterwards, the Fat Controller gives Thomas a very special reward.

James is feeling sad as he is still staying in his shed for being naughty. Eventually the Fat Controller lets him out to pull a goods train, but the trucks don't want to be pulled by James and misbehave. Whilst pulling them up Gordon's Hill, a coupling breaks and the last few trucks roll back down the hill. James goes to get them (they were stopped by the Guard) and starts on up the hill once more...

Gordon boasts to James that he is the only engine who can pull the Express. One day he sets off with it, but due to points problems he comes back to the station feeling very sheepish. Another engine will now have to take over the job of pulling the Express for the day, but who will it be?

In Autumn, Thomas stops by a signal. There he meets Terence the Tractor, and teases him about his caterpillar tracks. When winter comes, so does the snow. Thomas refuses to wear his snowplough, and when he does he breaks it. Due to this he ends up getting stuck in the snow...

Toby and Henrietta are old and shabby looking. James remarks about how dirty they are, and says how he'd never be seen looking like that. James then has to pull a goods train along Gordon's Hill, but the trucks push him down and up ahead, a train of Tar Wagons lies...

Thomas boasts of how his blue paintwork looks splendid. But he doesn't look so splendid when he gets covered in coal dust whilst working at the Coal Hopper! Percy laughs at his friend's accident, but it's not long before he has a mishap with coal too!

It's not a good day. Thomas's fireman doesn't come into work, which means that Thomas can't deliver his passengers, which means that he can't make his connection with Edward, which means that this makes everyone late and cross. Bertie offers to take Thomas's passengers; but he has a field day of it when Edward, tired of waiting, steams away. The chase is on!

In a lonely, rusty Scrapyard is poor Trevor the Traction Engine, who is ready to be broken up. He is feeling sorry for himself because he feels that he's too old-fashioned to be Useful. Edward finds Trevor's situation to be a tremendous shame, and is determined to find someone to buy Trevor and save him, but who would "have room for a Traction Engine at home?"

Duck is boasting about being Great Western and how useful he is, much to the annoyance of the others. Later, the Fat Controller introduces Diesel, a shunter who is "on trial". He asks Duck to show Diesel around, but Diesel says he doesn't need Duck. Duck leaves him to it and Diesel has an accident with some trucks. He thinks it's Duck's fault...

The engines are worried that Donald & Douglas might be sent away after their accidents. Edward suggests that they hold a Deputation - and poor Percy gets the task to tell the Fat Controller about it!

Bill & Ben are twins who work at the China Clay Pits. One day, they are aghast when they discover that their trucks have gone missing! Down the line, they cause great problems and difficulty with a diesel called Boco, who they believe stole the trucks. Confusion regains until Edward explains everything.

Knapford Station is being redecorated. When Mavis does not say hello, Emily assumes she is sad and chuffs to the quarry to cheer her up with some of the new flowers, only to cause Edward and Thomas to crash.