As mentioned on the general information, this is the only episode based on the novel Treasure Island
by Robert Louis Stevenson
. The plot is based on the book keeping all the characters and some elements such as The Black Spot. However, in this episode Jim is given the map by his father as opposed to Billy Bones and Pew is given a larger role in the programme and appears to be a sorcerer. The only new addition is Jane, an exclusive character to the series.