Silas King was born in Carson City, Nevada. He was a latent Mutant who worked as a smuggler of illicit narcotics. On a drug run from Los Angeles to New York City, King's van broke down in the Mojave Desert. Trying to make his way back to civilization, King spent several days out in the desert sun, which catalyzed his latent mutation. While recovering from sunstroke and dehydration in hospital, he realized he could discharge the solar energy he had stored in his body as heat blasts. Captain America and Falcon then get in a "Heated" Battle with "Solarr"!