The Hobgoblin lives on the top of a mountain at the end of the world, in a house without a roof and full of precious stones. He rides his flying panther around the world, looking for red rubies. The Hobgoblin has magic powers and can turn into anything. Most of the time, however, he is just a bearded man with red eyes, white gloves, a cloak and a magic hat to gather his rubies in.
The Hobgoblin is obsessed with rubies. More than anything, he wishes to find the King’s Ruby – the biggest ruby in the entire world. Surprisingly, he finds it one day in Moominvalley. At first sight, the Moomins are slightly frightened of the Hobgoblin, but they later decide that someone who eats pancakes can’t be that dangerous.