Aragorn is a winged horse ridden by Brunnhilda the Valkyrie and previously owned and ridden by Dr. Dane Whitman, the Black Knight. Whitman was the nephew of Professor Nathan Garrett, who had adopted the guise of the earlier, criminal Black Knight. In this role, Garrett had ridden a horse whom he had mutated using genetic engineering techniques that he had developed. The artificial mutations gave the horse large feathered wings and other special adaptations, which enabled him to fly. After Garrett's final defeat by the original Iron Man, this winged horse escaped and eventually was further mutated and fell into the possession of the Dreadknight. Garrett, dying from the fall he had suffered in the battle, persuaded Whitman to vow to use the scientific discoveries he had usedas the criminal Black Knight for good. Whitman decided to do so by becoming a new, heroic Black Knight. In pursuit of this goal, Whitman used Garrett's genetic techniques to mutate another horse, whom he named Aragorn, into a flying steed. When the new Black Knight left his own time for a temporary stay in the Twelfth Century A.D., he entrusted Aragorn to the care of Brunnhilda the Valkyrie, who remains his owner to this day. The Black Knight, having returned to his own time, now rides a mechanical flying steed.

Aragorn can fly by means of various adaptations given him through artificial mutation. The most prominent of these are his wing, which span eighteen and a half feet from wing tip to wingtip. The wings are fully feathered, like a bird's.

Aragorn flies by flapping his wings, creating enough lift to hold aloft at least 2000 pounds; in other words, he can support aloft his own weight, that of the Valkyrie (who, as an Asgardian goddess, weighs more than an ordinary human of her size and build: 475 pounds), and others passengers as well. Aragorn can fly at speeds ranging up to 125 miles per hours. He can fly at his top speed for about one hour before needing rest. Though he generally flies beneath the height of the clouds (6500 feet), Aragorn can reach a height of 10,000 feet with little effort.

Aragorn is highly intelligent, and will respond to a wide range of verbal commands given by the Valkyrie.

First Appearance: AVENGERS #48