Thomas brings the newest member of Jenny Packward's crew, Jack the front loader, to work. Jack is eager to be really useful and meets the rest of the members in his attempts to find a job. Oliver the Excavator is ordered to move a pile of rocks, but Jack foolishly tries to take them up the hill himself, leading to disaster.

Thomas is told to deliver a Christmas tree to the Mountain Village with Toby, but becomes cross when he has to use his old snowplough. A rock on the line smashes Thomas' snowplough into a water tower. Thomas is determined to go the rest of the way without a snowplough.