Fireman Sam is all set to win the Best Inventor in Wales competition, until Norman Price plays around with one of his inventions. Meanwhile Dilys Price leaves the iron on which causes a Fire at the General Store. Fireman Sam comes to the rescue.

All Christmas preparations stop when the crew are called out to rescue Sarah and James who are trapped on ice. Fireman Cridlington is in the kitchen preparing the turkey for Christmas. Fireman Trevor Evans' bus gets stuck in the snow and Fireman Sam comes to the rescue.

While cleaning the windows, Dilys falls off the ladder and loses her memory, meaning Norman Price is having to do a lot of explaining. A new fire-fighter: Penny Morris comes to Pontypandy from Newtown, and Fireman Cridlington is smitten with her. Later Trevor's bus gets stuck in a ditch and has to call Fireman Sam for help.