The series 1 episode "Electro" is the first appearance of Howlin' Jimmy Jefferson. His ghost is featured in this episode and referred to as the Spirit of Jazz. In this form he looks the same as he did when he was alive but now has a number of supernatural powers and uses them to possess people such as Howard. Howard ignorantly made a deal with him years ago, which the spirit claimed would make Howard one of the greatest jazz musicians of all time (in Yorkshire).