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|Affiliation of superhuman criminals.|
|Criminal alliance wanted by international law enforcement.|
|Nation or Planet of Origin|
|Base of Operations|
|Incredible Hulk Vol. 1|
|Incredible Hulk Vol. 1 #254 (Dec. 1980)|
|Bill Mantlo & Sal Buscema|
Wealthy industrialist Simon Utrecht craved power beyond that of mere mortals. Financing the construction of a spacecraft - Utrecht intended on exposing himself to comic rays to gain superhuman powers that he could exploit for illicit gain. Recruiting pilot Michael Steel, life-support specialist Ann Darnell and her brother fuel-propulsion engineer James Darnell; the four set course for the cosmic ray belt around the Earth.
Unlike the ship utilized by the Fantastic Four, Utrecht's ship had no radiation shielding leading to even more radical mutations. At the same moment as the quartets exposure to cosmic radiation, the Hulk coincidentally comes across the launch complex used by Utrecht. Reverting to Bruce Banner, he discovers the ship's monitoring station and fearing the group is in trouble Banner sets a course for Earth via remote control.
After a rough landing near their original launch site the four astronauts emerge with powers beyond normal humans. Utrecht dubbing himself Vector had gained the power to telepathically repel any object. Steel was transformed into a metallic powerhouse able to increase his density as Ironclad. Ann Darnell, who was exposed to gases from the life-support system along with the cosmic rays, and was transformed into Vapor. James Darnell became a being of living radiation dubbing himself X-Ray.
Believing that Banner cheated them of even greater power the quartet attacked the meek scientist. Panicked Banner transforms into the Hulk, and due to the quartet's inexperience in using their new abilities they are quickly defeated. Swearing vengeance upon the jade-skinned giant they would become a persistent adversary of the Hulk as the U-Foes.