On a very hot day, Sarah and James are picking potatoes for Bella. Fireman Sam wonders if he can help, but first he has to deal with a barn fire at Pandy Lane Farm.

After going to the sales at Newtown, Fireman Trevor Evans' tyre goes flat and The Spare Tyre invades Pontypandy, causing loads of delays. Luckily Fireman Sam comes to the rescue.