 Professor Nathan Garrett, the criminal Black Knight, developed genetic engineering techniques capable of granting a horse the wings of a bird.He used it to create a mount to ride during his criminal adventures.After Garrett's final defeat by Iron Man, this horse escaped, was found and further mutated by Victor Frankenstein's great-granddaughter Victoria (who had originally tried to restore it to normal), and fell into the possession of the Dreadknight, who named it the Hellhorse.