The Demogorgon in Stranger Things is inspired by the game Dungeons & Dragons. In the game, the Demogorgon is a demon prince with two heads that are in constant conflict but unable to dominate one another. This concept was adapted into the series, where the Demogorgon is a creature from The Upside Down, a parallel universe. The name Demogorgon is also associated with mythology, where it represents a god or demon linked to the underworld. The Demogorgon was the first character in Stranger Things to be named after a character from Dungeons & Dragons, a trend that continued with characters like the Mind Flayer and Vecna.