The Gravity Regulator Helmet was first developed by James Barr on the parallel world known as Earth-S. Shaped like the end of a bullet, the helmet provided its wearer with the ability to fly at supersonic speeds and the ability to deflect oncoming objects. Donning the helmet, Barr became a costumed adventurer using the name Bulletman. When his girlfriend Susan Kent discovered Jim's secret identity, a second helmet was fashioned and she became known as Bulletgirl.
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