Other than that he was born a mutant, very little is known about the history of Counter-Earth’s Solarr. It is known that at some point Baron Zemo convinced him to join his group of Thunderbolts.
Earth’s Thunderbolts set out to put a stop to the Thunderbolts plans of launching a satellite into space to give Germany sole access to global communications giving them control over the world economy. This led to a confrontation between the two groups in which Solarr was knocked unconscious by Fixer with the use of knock-out gas. Counter-Earth‘s Thunderbolts were shortly defeated by their counter-parts. Solarr’s current whereabouts are unknown.