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Demogoblin is a character that appears in LEGO Spider-Man: The Videogame.
After losing fights with Spider-Man and the Green Goblin, Jason Philip Macendale Jr., aka the Hobgoblin, took advantage of the Inferno crisis by following several demons back to their lair and confronting their demonic lord, N'Astirh. Macendale wanted enough power to defeat his enemies, and offered his soul to N'Astirh in exchange for such power. When N'Astirh stopped laughing, the demon lord decided that Macendale's effrontery was worth something even if his soul wasn't, and had him possessed. This gave Macendale the physical strength he craved, coupled with superhuman speed and endurance; unfortunately, the demon who possessed him proved to be incompatible, and the two fought many a battle for control of Macendale's physical form until the demon literally ripped away from its human host and began a separate existence as the Demogoblin.