Bulletman and Bulletgirl

Jim Barr, the son of a police officer killed in the line of duty, trained as a ballistics expert and inventor. Rejected by the police academy, he used chemistry to develop a so-called "crime cure" that increased his muscle mass and intelligence and designed a bullet-shaped "Gravity Regulator Helmet" that permitted flight and deflected bullets. Shortly after he began crime-fighting as Bulletman, he created a second helmet for his girlfriend Susan Kent; she assumed the identity Bulletgirl and later became his wife in the fiction. Their origin is presented as technological and chemical invention rather than mystical transformation.

The defining visual element is the bullet-shaped helmet — identified in sources as the "Gravity Regulator Helmet" — which is shown as extremely durable and bulletproof. Source accounts emphasize the helmet's shape and protective function; other costume details vary across Golden Age artwork and reprints, but the helmet is consistently the signature motif that gives them their name and capabilities.

After administering the chemical "crime cure," Jim Barr is described as gaining greater muscle mass and increased intelligence; Susan Kent receives the same enhancement when she becomes Bulletgirl. Both wear the bullet-shaped Gravity Regulator Helmet, which allows flight, deflects bullets, and provides exceptional durability (examples in period stories include Bulletgirl being run over by a Nazi tank and only knocked out, and Bulletman smashing a tank). They operate as crimefighters against gangsters, wartime villains (including Nazi antagonists), and a range of "weird, supernatural-themed" foes in Golden Age comics.