Tom, Charlie and the Twins spend the day at the beach. But when Tom takes a rest on his dingy he finds out that he's been washed out to sea when he wakes up.

It's Christmas in Pontypandy and Gareth takes the children to the Mountains for a Christmas surprise, Mrs. Chen tells Sam that the tree Dilys ordered for the town hasn't arrived, but Elvis promises her that Sam will find one, but the local radio has reported that a snow storm is heading their way and Gareth and the children are in trouble.