Set in (possibly magical) Medieval England, where a wizard and a trio of heroes go on a quest to save the world around December. As they do they they inadvertently cause the myth of Father Christmas / Santa Claus to be born (e.g. flying sleigh with Reindeer as they travel to stop someone at a certain stage, coal and oranges being strategically left in people's rooms as part of a protection spell are mistaken as gifts, etc.)