Also known as the Ketsueki Senshi, the Blood Soldiers were a group of Japanese metahumans assassins who worked for the Yakuza under the command of Tiger, ex-sidekick of the first Judomaster. In one of their missions they tried to capture the new Judomaster, Sonia Sato, daughter of a murdered yakuza with the intention of recruit her, but the intervention of the JSA and their newest member, the Superman of Earth-22, foiled the plans of Tiger and his soldiers.