Ronnie Hilliard's father was a scientist who was interested in the steadily growing class of superhumans, and performed experiments into the mutagenic effects of superhuman powers. The two worked side-by-side on the project, but an explosion in their power generator during an experiment killed Ronnie's father. Ronnie discovered that the accident had granted him superhuman powers. Enraged at his father's death, he blamed the existence of superhumans for leading his father to his doom, and vowed to use his own superhuman powers to make others turn against superhumans.
At the time, Spider-Man (Peter Parker) was a television performer represented by Max Shiffman, who was seeking other super-heroes to represent. Now garbed as Supercharger, Ronnie offered his talents to Shiffman, and was accepted. Supercharger was set to appear on "It's Amazing" alongside Spider-Man, but Supercharger used the event to show the public why they should fear superhumans, intending to murder the entire studio audience; however, Spider-Man fought back and drained Supercharger's power by tapping him into the studio's electrical equipment.
Supercharger's activities in the years following his defeat are not known, but he later appeared as a member of the Masters of Evil led by the Crimson Cowl (Justine Hammer). Supercharger aided the Cowl's plot to extort the world's governments using Weather Modulators, believing that the Masters help reinforce his anti-superhuman agenda; however, the Masters were opposed by the Thunderbolts, and Supercharger was defeated along with his teammates and sent to prison.