Helmets of powers, equipped with the means of refashion reality at the whims of their wicked wielders.
Atom-Master, the identity which an unnamed scientist of Earth-One christened himself, used his illusion generating helmet to a first impersonate Superman, Batman and Robin. Soon after, he devised a helmet that solidified objects he had envisioned using dust molecules, and used this state of the art equipment to initiate a crime wave with his gang. The World's Finest team finally defeated the criminal. Years later, Atom-Master returned with an improved helmet and once more faced Superman. During this confrontation, he was recruited into the Forgotten Villains, although he and his cronies were defeated by Superman and the Forgotten Heroes.
Karat was a mysterious man who sought the same buried treasure as archaeologists Helen and Rodney Phelps, an ancient helmet that could rearrange matter into any shape that its wearer conceptualized. When the Phelps, thanks to help they received from the equally enigmatic Jungle Man, discovered this device and sought to return it to England for study at the museum they were affiliated with. However, the trio faced Karat and his minions, who temporarily stole the helmet which Karat knew how to activate through his own research. However, Jungle Man was able to retrieve the head gear and return it to the archaeologists, while sacrificing his own life to save them. However, as he was one of a long line of heroes throughout the ages empowered by an alien meteor rock, Jungle Man's memories were transplanted into another man known as Mark King. Sometime later, it was King, who had become reacquainted with the Phelps, who once more had to deal with Karat. Karat yet again purloined the helmet, and instead of beasts as he initially created, he created energy men and a deadly missile to use against his adversary. Mark defeated Karat, and once more gave his life to save others while dealing with Karat's missile.