Duke Sigmund Igthorn is the main antagonist of Disney's 1985-91 television series Adventures of the Gummi Bears. Duke Igthorn was once a knight of Dunwyn who was exiled for conspiring against King Gregor. At an unknown point afterwards, he took control of a rundown castle called Drekmore and its resident pack of Ogres. Since then, he has constantly conspired to usurp King Gregor and rule Dunwyn himself. He has a brother, Victor Igthorn, who is a brave knight that fights evil. It is implied at several points that Duke Igthorn's father had attempted to control Dunwyn and raised his son to do the same.