Dragon Man is a fictional supervillain native to Marvel Comics and has become the tool of villains such as Diablo against various superheroes, such as the Fantastic Four. Dragon Man was an experimental creation of Professor Gregson Gilbert of State University. The benevolent professor had fashioned an artificial dragon-like creature but lacked the means to make it function. Having heard through secret means of Gilbert's experiments, the alchemist Diablo convinced the professor to give the creature life through one of Diablo's alchemical potions. To Gilbert's shock and regret, Diablo used his control over the creature's will to seek revenge on the hero team Fantastic Four.
Dragon Man in Fantastic Four: World's Greatest Heroes