Billy Roberts was an evangelist who elicited unwavering devotion from his religious flock. One of his followers, sanitation worker Bob Farmer, found the discarded power prism left behind byt the former Doctor Spectrum, Kinji Obatu after his confrontation with Iron Man. Using the prism to expand his power base, Roberts as the new Doctor sought out the other members of the Squadron Sinister. Along with Hyperion, the Whizzer and Nighthawk, the quartet were themselves recruited by the alien Nebulon leading to a battle with the Defenders. While Nighthawk switched sides, his three former comrades continued their criminal careers upon returning to Earth following their last defeat, although once more it was the Defenders who vanquished the terrible trio. On one later occasion, when the power prism was in the possession of the Avenger known as the Wasp, her allies sought out Roberts who had been made to forget his former felonious ways. Seeking to reclaim the prism under the guise of aiding the Avengers, he was nonetheless vanquished once more soon after reclaiming it.
On Earth-712, the counterpart to Billy Roberts was a man named Lewis, who had himself through his charming style created a following for himself during the tumult that followed Over-Mind's attack on that world. Forming his world's version of the Freedom Force, Lewis sought to disrupt the efforts of the Squadron Supreme to restore order. While in a confrontation with three of its members, Lewis' associate retrieved the power prism which Doctor Spectrum relinquished during a hostage situation. However, Lewis was unable to gain mastery of the prism as had his cosmic twin, since its owner Joseph Ledger had for several years meld his mind to the alien jewel. As a result, Lewis' Freedom Force... and his attempt at claiming the mantle of Doctor Spectrum... were quickly and decisively disrupted.