It's winter in the top left-hand corner of Wales and Ivor's railway is not running because of deep snow. Llaniog needs supplies soon, though, as Eli the Baker is nearly out of flour. What Ivor needs is a snowplough.

Thanks to a new snowplough, Jones and Ivor have collected supplies from Grumbly. On the way back they come up against an unusual snowdrift.

Ivor is having a lovely time in the snow. With a winch attached to his front, he is pulling the children on sledges up the hill. He pulls too many at a time and ends up wheel-deep in the snow. Various rescue attempts prove futile.

Some old fashioned pushers and pullers come to Ivor's rescue.

There's a fire at Mr Pugh's barn but the new fire engine has got stuck in the snow. Ivor comes to the rescue, taking along the firemen and a hand-pump.

Something's very fishy when Ivor won't go under the water tower.

Jones and Ivor decide to help a family of birds that have built a nest on the line.

Jones and Ivor desperately need to find the birds a home, but Mrs Porty has an answer to this problem.

Ivor receives a mysterious package in the post. It turns out to be a trumpet from some old friends and comes in handy for rounding up Old Idwoll's sheep.

The Grumbly Choir decide to spend some time having fun at Tewyn Beach after taking part in the Eisteddfod. Of course, Ivor is left alone and feels very sad. Back at Grumbly, standing sad and alone again, he decides to go off on his own.

Jones discovers Ivor has gone and Mrs Porty suspects bandits. It isn't bandits, of course, and they find the engine at Tewyn beach.

The choir are going on their now annual outing to Tewyn beach. They are planning a very special surprise for Ivor.

Jones and Dai are watching the sheep dog trials and a very large contestant turns up to enter.

Ivor goes off with Banger's Circus as "The Singing Engine". His replacement is a Juggernaut built by Bynon Smith. It turns out to be a lot less reliable than Ivor.

Ivor returns along with a small fortune and knows just what he wants to buy.

It's a lovely summers day and Ivor has finished all his work. Jones and Dai decide to go and relax by the river. Ivor feels a little left out standing by the station platform so he goes off on his own.

The Dragons have nearly run out of Half-Crowns for their gas meter at Smoke Hill. Jones and Ivor find some in one of the most unlikely places.

Ivor has gone off on his own again. Dai gets quite cross about it, while Jones finds Ivor at Mr Pugh's farm along with some guests.

There are some problems with Smoke Hill again. So, Jones, Ivor and the dragons go to Llanmad to see Mrs Griffiths. While there, Gaian and Blodwen encounter an old enemy.

The Dragons are in danger of being caged. Luckily, Mr Dinwiddy knows just the place for them to live.