Powers: All four Elementals had control over the ancient elements. Hellfire controlled fire. His control was powerful enough that he could generate flames over an entire city.
Bio: Hydron is a member of The Elementals. After being cast out of one Universe, they travelled to Earth where they appeared as Gods. They tried to extend the kingdom they had made for themselves into the borders of Egypt.
There, a warrior by the name of Dann, plotted against them with the wizard Garrett. The two of them created the ruby scarab, which they used to sap the Eternals powers and banish them from their world.
By some unknown means centuries later, they regained their powers and the ability to travel to Earth.
In their attempts to locate the scarab and take control of Earth again, The Elementals have faced The Living Mummy and Ms. Marvel. They have been defeated both times.
During their encounters with The Living Mummy, Zephyr was deemed a traitor and has since battled the rest of the Elementals.