Julian is woken by an emergency call in the middle of the night, Moobaloo the heifer has been struggling in labour but there is no sign of the calf. And tiny Teeny, a seven-day-old Shetland foal, is rushed in to see vet Helen.

It's Christmas in Thirsk, but the vets cannot join in the celebrations until they have tended to their flock. A cow has collapsed on Chris's farm leading Peter to fear the worst, Barney the spaniel may have to have a leg amputated and a piglet named Tiny Tim needs some urgent care. When things settle down, Peter and Julian have the honour of switching on Thirsk's Christmas lights.